A/N: I don't own amy of the Criminal Minds characters and I am not making any money from writing this.

Please forgive any minor spelling or grammar mistakes, English is not my native language.

I can't find JJ's exact birthday, so I've put February 19th, if somebody knows, feel free to correct me.

References: Daniel Milworth, a budding serial killer, aka "The Caller", from the episode 9x10 "The Caller", and the cult "Forever People" from the episode 10x11 "The Forever People".

Just a reminder: in season ten finale, JJ was revealed to be pregnant.

Soon, all the team members were back in the conference room, sitting around the table and trying to link all those newly found informations into a meanigful picture. Spencer just finished reading one of the files and Aaron took a sip of water.

"The unsub tried to convince Daniele to obtain information for her, plant the listening devices", Derek was reasoning. "Probably threatened her, offered her money. Daniele refused, there was a struggle, Daniele pulled out the gun, the unsub got an upper hand and killed her."

"She put the body in the freezer in order to conceal the right time of death, disguised herself as Daniele and went to work using her pass card. She then went back to the house and estaged suicide."

"How was she even able to find about Daniele? Where Daniele worked."

"They could have known each other, but we didn't find anything suspicious in her life."

"The FBI database is well secured and it would be hard, if not impossible, to hack into it without alerting attention or living a trace. But it would be much easier, especially for an experienced hacker, to hack into a local employment bureau or a delivery service. Garcia is checking the records now."

And that was when he received a call from her.

She started talking before he even put her on a speaker phone.

"Hello, my pet peeves!" She quickly turned serious. "Anyway, our hacker did a good job of hacking into an employment bureau. But I got an IP address. I was able to trace it back to a local library. I did some more digging and, brilliant as I am, found a clue. There was a parking ticket written for the car parked near the cafe at the same day system was hacked, at the approximate time. The car was registered to thirty eight year old Selma Rain. In 2009 she was convicted of hacking into her boss's personal computer as well as into the computers belonging to several of her co workers. Got five years. Was released from prison a year ago."

"So, she wouldn't be allowed to use Internet. She had to use a public computer."

"Not really", Penelope cringed. "Selma was found dead in her house two months ago, murdered by a blunt force trauma to the head." The agents exchanged glances as Penelope continued. "The police was looking into her crime, her cellmates, didn't get anywhere so they wrote it off as a burglary gone wrong. The house was ransacked, valuables were missing. Apparently they didn't find out about the ticket or didn't consider that to be important since I don't see any mention of it in the reports. Also, I've tried locating the spot to where the devices had been transporting signal, but it it is bouncing back and forth against several low frequencies real fast."

"The unsub used her to gain access to the employee list and to obtain the listening device, to learn how to manage them, and then murdered her in order to cover up her tracks", David concluded. "Since she was a woman, probably a young one, the victims didn't feel threatened and would open her the door."

"I'll keep researching about her cellmates, maybe I will find something", Penelope promised, already typing something away.

Derek smiled. "Thank you, mama." Penelope grinned to herself before ending the call and getting back to her work. At that moment, Joan stood up, grabbing her purse.

"I have to go", she said. "I have a doctor's appointment."

Aaron just nodded his head, having already been aware of that. " OK. We'll keep you posted."

JJ nodded and headed for the exit.

"You need a ride?", Derek asked.

"No, I can handle it. Also, there is a police patrteeth block away and another one in front of my house."

Spencer frowned, all the pieces of puzzle falling into place. "Can handle it..." He looked away from the door, excited. "Maybe our unsub is a mercy killer."

He met eyes with Aaron.

"All the families were going through the hard time. Lou and his family were receiving dead threats. Kelly got shot. Eric was under stress. Maybe the unsub wanted to spare them the further anguish caused by the parental figure who is an FBI agent."

Derek considered it. "A single gunshot wound to the back of the head. Quick and relatively painless."

David was deep in thoughts. "Children die first. They don't have to watch their loved ones die."

"Then the others, up to the oldest member", Spencer said.

"Because, in her mind, the oldest ones are the most responsible", Aaron finished.

Derek leaned back in his chair. "Well, most of serial killers develop their compulsions due to the events within their close environment. Usually a family."

"And mostly in their childhood too", Aaron added. "Which is another reason why she would identify herself with the daughter."

"I am going to call Garcia, tell her to look into any serious incidenta involving FBI agents who had daughters dating up to twenty years back." He pulled out hid phone. "Of course, we can't know was it an incident similar to these murders that triggered the unsub's psychosis or was it an unreported abuse or a long term neglicence due to a job, but it is worth a try."

JJ sighed tiredly as she sat at the driver's seat and fastened the seat belt. She was about to start the engine when she saw a figure raise up from the back seat. She felt her stomach sink and, suppressing a gasp, reached for her gun, but just when her fingers touched the holster, she felt a tight grip on her hand. Her other fist clenched, but she sat still upon seeing the gun being pointed to the back of her head.

JJ gulped and met eyes, in the mirror, with a young red haired woman behind her. The assailant was wearing dark baggy jacket and had black leather gloves over her hands, and her mouth moved into a grotesque smile.

"Now, you will be a good girl and do exactly what I say."

#

Meanwhile, everyone else in the BAU remained calm and oblivious of what was really happening a short distance away. Well, everyone except for Spencer. After pulling his phone back down his pocket, he looked up at the rest of the agents, an almost panicked expression on his face. "I think I've discovered something."

Everyone just stared at him, waiting for him to continue. It took him a few seconds to realize that. "Lou Rivers was born on January 25th 1968. Kelly was born on January 21st 1975. Eric on February 18th 1980."

"That could be a pattern that our unsub is sticking to", David said.

Spencer looked at Aaron, his face pale. "And JJ was born on February 19th."

Aaron remained calm. "That doesn't mean that he will instantly go after her family."

"Yes, but I tried calling her on her private phone, and home phone... she isn't answering." He looked around. "And... she started attending counseling... after what happened with the Forever People."

Derek and David exchanged a glance. Aaron quickly pulled out his phone and called the police officer assigned to look after JJ. The seconds felt like hours, and once he got a hold of him, Aaron felt a mixture of fear.

"Hallo?"

"Is JJ home yet?", Hotch asked, avoiding to look at his team mates.

"I don't know, ask her", answered nonchallantly, and all the color left Aaron's face.

"How do you mean?", he almost yelled.

"She called the protection off", answered, confused.

"Both the one here and the one at home?"

"Yes. Said that you've caught the guy."

Aaron ended the call without further explanation and went to take his coat. Others stood up, looking at him with a sense of dread. "We have to go over to her house!", he ordered. "Something is wrong."

#

Black SUV was flowing down tje street, getting closer to each destintation with every torturous moment. The blonde's eyes kept gazing back and forth, desperarely looking for, but finding none. "How did you manage to break inJ?", words escaped JJ's lips, making Kaley scoff.

"Typical FBI agent. Even in times like this..." But she couldn't help but gloat. "Let's say that, A) I've done my homework and B) I have a friend who taught me some things." She looked through the window for a moment. "Well, I had. She was a liability, had to be eliminated. Nice girl... such a shame." Her voice turned stern again. "But it was for a greater good."

JJ was on the verge of tears as a horrific realization sinked in. "You... you only target families", she said as her fingernails dug into the steering wheel. "And you are careful. You have barely left any clues." She shivered as the tears rolled down her face. "But you allow me to see your face."

Kaley grinned. "I detest changing my habits, but I have to, honey. You're pregnant."

JJ's eyes turned blurry, but she was still able to see her house at the side of the road. She slowly pulled into the driweway, feeling her breathing hitch. Kaley chuckled. "Now go out. Nice and slowly..."

#

Aaron was driving as fast as possible, doing his best to avoid the incomming cars and red lights.

"Garcia tried tracking JJ's phone and her car through the GPS system, but something is blocking the signal", Derek explained. It was then that his ringtone went off: he pulled out his phone and immediately answered the call, putting Garcia on the speaker.

"OK, I've widened my search and found a person of interest."

"Talk to us."

"Kaley Green. Born on February 27th, 1985 in San Francisco, to a father, Liam, and a mother, Katy. She had an older sister, Greta. Her father, was an FBI agent in a division specialized in sex crimes. No incidents... once the police arrived at their home due to an argument. Katy tried getting Liam move to the desk job or quit the job, things went out of hand. And..." Penelope stopped as she read the incomming information, her jaw almost hitting the floor. "Oh my God... on September 17th 1997 a child molester that Liam had arrested in 1992, Alan Sayer, murdered a CO and the driver while being transported to a near by City where he was to stand trial for another crime. He took the COs gun with him. He first abducted and tortured a local ADA who knew Liam's address and evebtually provided it to him. Alan then murdered him and broke into Liam's house during dinner time and shot Katy and Greta multiple times in front of Kaley, killing them, and shot Liam non fatally." She quickly started typing something again. "Liam managed to gun him down. Soon after the incident he retired and moved with Kaley to Wisconsin. At the age of twenty two, after graduating college, she moved to Quantico, but judging by the phone records they kept in touch. Liam died of a heart attack three months ago."

"That must have been her trigger", Aaron concluded.

"And she committed her first murder on the anniversary of her family massacre", Spencer added.

"Liam had been suffering from depression throughout his life, that seemed to have increased as Kaley was growing older and dropped slightly once she moved away", Penelope added.

David's face went pale. "She was psychologically abusing him. Blaming him for what happened to her mother and sister."

"Such cruelty isn't typical for angels of death", Derek noted.

"She is in part an Angel of death, in part the sadist, similar to Daniel Milworth, "The Caller"", Spencer said. "She is murdering the families in order to spare them the suffering and in order to hurt the agents who created their families and therefore created the possiblity of the family getting hurt. She came to enjoy watching her father suffer. In her mind such turmoil is probably worse than death."

David continued. "Judging by his amount of work, he was likely absent often before and she had probably formed a stronger bond with her mother and sister. They tried convincing him to change the job, but he wouldn't listen. And then the worst possible scenario happened and Kaley witnessed it. And her father was later receiving empathy from his friends and neighbors and colleagues and was celebrated as a hero for killing the child molester and saving his daughter. Such experience must have left her psychologically damaged. That is why she is targeting families who already have problems. Or, at least, members who are FBI agents do. And she isn't interested in parents or siblings. She is targeting families that the agents themselves have created,or are planning to create, because she can relate to them."

"What was her father's birthday?", Spencer asked.

"January 25th 1962. And her father's official weapon was Glock 9mm."

David's face fell. "Which explains her weapon of choice."

"It wouldn't surprise me if she is using the exact same gun while committing the killings", Aaron said.

Penelope nodded her head. "She inherited it, as well as all of her father's possession, after his death. She owns a blue SUV. And she owns a gallery, so she would be able to... you know... plant the device in the frame without leaving much clue. I am sending you her home and work address now!"

"It looks like we'll have to go there later", Aaron snapped back.

"The patrol is going there, but since she murdered all the other victims in their holes, it is likely that she is taking JJ there", Spencer exclaimed.

Garcia continued. "Aaand in 2013 she was convicted of an assault, sentenced to a year in prison. Selma Rain was her cellmate the whole time."

Derek ended the call and put the phone away. Aaron took a deep breath.

One more block. David already pulled out his gun. Then Derek. Spencer took his revolver in hand and looked at it with heavy eyes, something aching in his chest.

JJ's house. Spencer's heart skipped a beat.

Aaron stepped on the breaks.

They got out of the car, closing the door behind.

They started walking toward the front door. One step. Second step. Third step. Aaron wrapped his hand around the door knob. Spencer rushed over. Derek was already there.

They opened the door and rushed inside, with the guns pointed.

JJ, Will and Henry were lying on the floor on their knees, turned with their back against the wall, their wrists bind and their mouth gagged.

Luckily, they were alive.

David and Spencer rushed over to help them, while Derek and Aaron rushed toward the back door, catching a glimpse of an unsub running outside.

Spencer pulled the gag out of Henry's mouth and hugged him. Derek did the same to Will, who gasped. Spencer then rushed over to JJ and released her too. She was barely even crying, just shaking and staring at him, still in shock.

"Please take me to the doctor", she whispered.

"I will", Spencer replied, choking back tears.

"My baby... my baby has to be OK." Tears started running down her face. "I hope that she is OK..." Spencer wrapped her into a tight hug, testing his chin against her shoulder, while Derek helped Will stand up.

"Everything will be OK, JJ. Everything will be OK."

Meanwhile, Aaron and Derek were chasing Kaley down the street. Aaron was having a head start, though Derek was doing his best to catch up to him. Kaley was still ten feet ahead. "Kaley Green, stop!", Derek repeated.

Kaley stopped, turned towards them and fired, but only managed to hit a near by wall. Aaron fired at her, but only hit a near by telephone stool. Aaron managed to run accross the street, but when Derej was about to do the same, a long truck started driving by.

Derek sighed, panting, and looked away. That didn't look good.

Kaley rushed into a near by building, that was abandoned. She managed to get a head start by throwing a trash can in front of Aaron, startling him for a moment. By the time he rushed inside, she was already on the first floor.

And soon the second. And the third. But he was always close after her.

By the fourth floor, she thought that she had caught a break. He was nowhere to be seen, and she rushed into one of the abandoned apartments, deciding to confuse Aaron by escaping down the fire stairs.

But before she was even able to get to the window, she felt somebody stand behind her.

She saw a shadow of a man pointing the gun at her. "Stop, Kaley."

So she stopped, and slowly turned to face him.

"Let me see your hands", Aaron said, since Kaley's hands were in her pockets: she was probably playing with him.

"I saved them", she said calmly.

Aaron was indifferent to that. "Hands, Kaley." He didn't hear Derek also rushing up the stairs.

"You of all people should know... special agent Aaron Hotchner."

Aaron froze. "For the last time, Kaley."

Kaley took a ste closer. And another one. Aaron was unable to get a clear look at her hands. He put his finger on the trigger,

"I've done my homework", Kaley informed him, then pouted. "Poor Haley."

"Hands."

Kaley licked her lips and lowered her face. She stopped a mere inch away from Hotch. "I think that, while she was dying there in pain, certainly thinking that that moster was going cut your precious little boy to the ribbons as soon as she would take her last breath, the last thing going through her mind was: "I wish I have never married him! This is all his fault!"" She tilted her head to the side as Aaron's face was red with rage. "Do you ever think that way, agent Hotchner?"

Meanwhile, Derek was approaching fast, with his gun drawn.

One step. Another step. Two steps at the time.

Then, a gunshot.

Derek stopped in his tracks for a moment, cold chill rushing through his body, before continuing to climb up, floor after floor, even faster, checking every room, until finally, he realized with a shock, reaching their destination on the fifth floor.

Aaron was sitting on the couch, shaking, staring at the floor. A few feet away, on the floor, laid Kaley's lifeless body, blood oozing around the gunshot wound to her chest.

Aaron's gun was laying on the couch near by.

Kaley's was nowhere to be seen.

Aaron looked up and turned towards Derek, face pale and eyes watery. He tried to say something, but the words couldn't come out.

Derek lowered his gun and sighed sadly.

~THE END~

A/N: I know, I know... a cliffhanger! But I will write a sequel very soon, I promise! And probably explain some case details from this story further, such as Kaley managing to break into JJ's car.

Also, I promise that I won't put the characters through angst too much.

Until the next time, readers :)