AN: Okay so this is my first fanfiction, so bear with me :) I've had some wonderful people help me with this so not all the credit goes to me hah. This will be multi chaptered, I'm not sure I'll have a strict update honestly my life gets pretty busy at the drop of a hat! But I'm really excited about this and I hope you all like it. Anyway, this is linstead, Justin will play a role in this as well, along with some Fire characters (Shay's not dead here) Hank doesn't know about Erin and Jay yet. I think that's about it. All credit to the producers and creators of all things Chicago, I am obviously not Derek Haas or Dick Wolf or any of those fine people. (Man, I wish I was tho!)

Antonio Dawson and Jay Halstead walked up the stairs into Intelligence, looking around. Olinski was sitting in his little corner, meanwhile, Atwater and Ruzek were joking around and finishing up some paperwork. Slow days, while rare in intelligence, happen. Nothing looked out the normal except for one thing. A certain blonde was nowhere to be seen. Halstead looked at his friend, crinkling his eyebrow, "Where's Erin?" he asks.

Antonio shrugs his shoulders, taking his coat off and looking at Erin's empty desk. "Ask Voight, maybe she took the day off or something?"

"I thought she was meeting the two of you at the gym?" Atwater piped in, spinning in his chair and pointing his pen at Dawson and Halstead.

If no one knew where Erin was, he might as well go straight to Voight like Antonio suggested.

Jay knocks on Voight's door, halfway standing in his office leaning on the door jam, "You seen Lindsay?"

"No, I thought she was with you and Antonio?" Hank said, barely looking up at him, focused on the mountain of paperwork in front of him.

"No, she was supposed to. Thought maybe she had some paperwork or something" Jay said starting to worry a little, "I'll call her?" He said with a bit of a question in his voice. It wasn't like Erin to just not show up. She always had the decency to give a heads up so they weren't left hanging. He decided that if she didn't answer his call, he'd check on her.

"If she doesn't answer, I'm going to go stop by her apartment to see if she's there." he stated as he left the man's doorway, not leaving an opening for him to say no. Hank might be hard to communicate with at times, but when it came to Erin, very little took priority.

"Sounds good." He responded, looking up, "She always calls…Hell, I have to make her take sick days."

"Alright" Halstead said nodding and grabbing his coat and phone from his desk. The past couple of weeks had seen a rise in crime on the streets of Chicago. The day had started out slow, but it looked like it was picking up, the team along with Burgess and Roman were heading out on a call.

After six rings he got her voicemail. You've reached Detective Lindsay, leave a message I'll get back to you.

He barely took two steps toward the stairs before getting interrupted.

"Grab your gear" Voight said walking out of his office. No bullshit and no games, that was Detective Voight. "You're not going alone." He lowered his voice as he spoke to Jay, not wanting to alert the rest of the team just yet. Jay just shook his head continuing on his way. "Dawson, we're going to check on Erin first." Jay said alerting him to the plans that were already in motion.

They walked down the stairs exiting out of the front precinct door. Heading straight for Antonio's car, Jay headed for his rightful spot in the passenger seat. Some things never change.

As they drove the short distance to her building Jay began to showcase his anxious behavior as he sat there. His right leg was shaking, arm propped on the door holding his chin in his hand. It didn't take a genius to see and he certainly didn't feel like hiding it.

"What's your problem Halstead?" Antonio asks the detective gesturing to his leg. Jay pulled his hand away from his face and onto his leg, hoping to stop the shaking.

"I don't know man, something seems weird. She would've called or texted if she wasn't going to make it to the gym." He knew he sounded like a broken record repeating the same thing over and over. It was something he couldn't control. It happened often when he got worried. The subject could change but his habits never faltered. "She's never late to work and she would have at least told Voight."

"Maybe she overslept or something. I'm sure she's fine." Dawson pats his shoulder, trying to reassure the man. But if he was being honest with himself, he was starting to worry a little as well. Luckily for them, they pulled up to Lindsay's building just in time to not let the worrying thoughts linger.

"Car's out front," Jay's quick to observe and Antonio nods his head knowingly.

They follow the familiar path into the building and up the flight of stairs. Erin was lucky enough to get an apartment on the first floor. He remembers the day they were talking about why she chose it. What made it special enough to make it her home. The first thing out of her mouth was, 'Do I look like someone that likes to walk up three flights of stairs with groceries?'

He was brought out of his reminiscing as soon as her door became visible. "Shit," Jay said, pulling his gun out. Following Jay's gaze, Antonio turns his attention to Erin's open apartment door and started to draw his 45, not even bothering to announce his presence. When it's one of your own, protocols seem to lose their importance.

"We gotta call Voight," Antonio said pulled out his phone and grabbed Jay's arm stopping him from walking into Erin's apartment. The dirty look on Jay's face wasn't missed when he tugged his arm out his grip. "If this is what we think it is, we can't disturb anything for the crime unit."

"But what if she's hurt or something.."Jay objected, they had no idea what this was, maybe she came in and forgot to close her door all the way-unlikely but maybe. Or what if she was.. he stopped himself he couldn't think like that, not now. Jay knew Antonio was right, "Yeah, okay," he sighed, nodding his head and holstering his gun. His mind was starting to spiral in different directions. Anything could have happened to her, she could be lying in her apartment dead for all they knew. He kept telling himself not to go there, but he couldn't help it. Erin was his partner, his girlfriend, he didn't know if he could handle anything happening to her. He inhaled sharply through his nose trying to call on whatever relaxing behaviors he could.

They weren't making it to that other call.

Hank slammed his phone down, standing up and walking out of his office into the bullpen. "Grab your gear!" he says gruffly. He was a man on a mission.

"Another call boss?" Ruzek questions, slowly getting up.

"Just grab your damn stuff Ruzek," Voight yells, as Olinski looks at him and Hank looks down and shakes his head slightly. If you hadn't been paying attention you wouldn't have noticed the exchange at all.

They all head out quickly.

Olinsky rides with Voight, Ruzek with Atwater and Burgess and Roman followed them in the squad car.

"Hank, what's going on?" Olinsky asks him, it wasn't like him to get this worked up over nothing. It had to be serious. He also didn't like being left in the dark.

"It's Erin," He answers grimly, stepping on the gas.

As soon as they pulled up to Erin's building, Hank jumped out of the car as quickly as he could, racing to get to her apartment where the unknown waited. Halstead was pacing up and down the hall and Dawson was just standing outside of the cracked door, "What do you got?"

"Waiting on you boss." Antonio says, looking at Hank, seeing the creases in his forehead. His eyes hard with worry accompanying the stern set of his lips.

"Let's see what we got." Voight says walking in first, "Nobody touches anything without gloves"

The team files into her apartment one by one. As each room was cleared, confusion set in even further. Not a damn thing was out of place. The place was spotless for her standards.

"Hank, there's nothing here" Antonio sighed. It just didn't make sense.

The idea that something could have happened to Erin was making Hank's stomach knot. "Burgess, Roman! Go talk to her building super. I want to know when she was here last, when she left, and who was going in and out. Time stamps on everything. Make sure to note anything out of the ordinary on that security footage. Take everything they got!"

"You got it boss." Burgess answered quickly walking down the stairs with Roman closely behind.

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