A/N this is a spin off of my main fic Demigods and Wizards, so read that first (that also means this is Percy Jackson and The Olympians crossover), this fic officially starts after the demigods return to America at the end of the school year. As with the other fic, bold are spells, italics are in Ancient Greek, only difference, 'inverted commas' are thoughts.

The two wizards, Janet Harker and Thom, her father, looked at the city Thom had been sent to investigate, it was a small city, with rows of terraced houses eventually leading up to brownstone tenements, and finally a couple of tall office buildings, there was a shopping district, a high school, a library and a large mayor's office.

"Janet, we'll start by talking to the mayor." Janet looked up at her father, he was a tall man, with salt and pepper hair, kind blue eyes and a weather-beaten face, he was wearing a tweed suit and a waistcoat, oblivious to Indiana's summer heat. "After all, he was the one who asked the Aurors for help, then we'll talk to the town's resident ghost hunters, see what they know about the ghosts, I doubt it's much, they are only muggles, so their perception is limited."

"Muggles are more perceptive than wizards think Dad," Janet said looking out over the city, "sometimes they make connections we don't." Janet was very short for her twelve years, with long blond hair and clever brown eyes so dark they were almost black, what Janet lacked in height she made up for in intelligence and presence. Despite her height Janet had an air of one used to command, she was dressed in a blue t-shirt, jeans and a white cardigan with a satchel over one shoulder, she is wearing two silver snake bracelets with green eyes.

"Thank you for coming Mr Harker," Mayor Ernesto Montez was a man of medium height, beady green eyes, a seriously retreating hairline, and a large black moustache. "Up until now I had been content on letting the Fentons deal with the ghosts, they do catch some ghosts, but they don't catch all of them, and with the elections around the corner I want to show the public that I'm doing something about the ghosts."

"I can understand your concern Mayor Montez."

"I particularly want you to catch the ghostly thief Inviso-Bill," the mayor handed Thom a picture, he studied it and passed it to Janet who pocketed the picture, the picture was of a teenager with white hair, green eyes, and tan skin, he looked to be about fourteen, he was wearing a black and white hazmat suit. "We aren't too sure what to make of him, sometimes he hunts other ghosts, but a while back he turned to theft, and then back to ghost hunting, but he is causing large amounts of damage to buildings whilst hunting other ghosts."

"We will keep a look out for him Mr Mayor."

"One question Mr Harker, why did you bring a child with you?"

"My daughter, it's the summer, and we rarely see each other, so I brought her along."

"You brought a child to hunt ghosts?"

"She is almost as competent with the, err, equipment I use as I am."

The mayor did not look too happy over this, "very well, the Fentons live over there on Johnson street, you can't miss it, looks like a spaceship landed on their house."

"It does look like a spaceship landed on their house," Janet said looking at the squat brownstone with its giant metal extension, "or like the building is wearing a giant metal hat," Thom chuckled and ruffled Janet's hair. They walked up to the building and knocked.

"GHOSTS!" Came an exclamation inside, Thom raised an eyebrow, then the door swung open and a huge man in an orange jumpsuit pointed a weird gun at Thom, "wait, you're not ghosts," he sounded almost disappointed as the large gun powered down, "and I thought I could finally use the Fenton Freak Slimer."

"Yes Mr Fenton," Thom began before Mr Fenton cut him off.

"Please, call me Jack," Jack smiled, he was a very tall man with large blue eyes, a strong chin, and black hair that had turned white around the sides.

"Right, Jack, I am here to ask you a few questions about ghosts."

"Well, you've come to the right place; my wife and I are the foremost experts on ghosts in the Americas."

"I was aware, I have been brought in by the mayor to hopefully deal with the ghost problem once and for all."

"No need for that, we've got things under control, it's only a matter of time before we catch the ghosts."

"Jack, can we please sit down somewhere, so we can coordinate our efforts to deal with the ghosts, if you don't mind I would like to know what you know about the towns ghosts, just personalities etc."

"Yeah, sure we can go to the living room, your daughter can wait in the kitchen if she likes. My wife and son should be back soon, and my daughter is over at a friend's house."

"I'm sure that Janet," Thom began.

"I would be fine with that, I could get some reading done," Janet said smiling.

"Very well Janet, have fun."

The adults sat down in the living room whilst Jane sat in the kitchen and read the section about ghosts in An Essential Book of Spells and Knowledge for Children of Hecate. About ten minutes later a feminine voice called, "honey, I'm home."

'That must be Mrs Fenton,' Janet thought, 'which means their son will probably be sent in here soon, there goes my peace and quiet,' footsteps approached the kitchen and Janet put her book down.

"Who are you," a voice asked, Janet looked at the entrance of the kitchen, and there stood a boy. He was about fourteen, with ebony black hair and big light blue eyes; he was wearing blue jeans, red and white trainers, and a white shirt with red around the hem and cuffs and in an oval in the centre.

"I am Janet Harker, and before you say anything, yes I am English," Janet said jumping down from the counter where she sat, she walked over to the boy and held out her hand "and you are?"

The boy looked confused for a moment, "Danny Fenton," he said shaking her hand, both were surprised by the other's grip, "why are you in my house?"

"Following your parents numerous failed attempts to capture the ghosts in the town the mayor asked my Dad to deal with the ghosts."

Danny rubbed the back of his neck nervously, 'what's he got to be nervous about?' "So, your Dad is a professional ghost catcher?"

"No, not just ghosts, the mayor asked the state government for help, who in turn asked other people for help, eventually the messaged reached my Dad's boss, who sent him."

"So, how are you going to catch the ghosts?"

"That's why we came here, Dad wants to read your parents research, then we'll do some research, and devise a way to catch the ghosts." then something struck her about Danny. Janet reached into her pocket to look at the picture of Inviso-Bill again, she held the picture up to look at it next to his face, "if you ignore the eyes, hair and skin tone, they can be changed by contact lenses, a wig and makeup, the match is uncanny," she muttered looking at Danny.

Danny gulped, "what's uncanny?" Janet turned the picture around so that Danny could see, he backed away open mouthed, Janet did not even need to cast legilimens to feel the fear and panic rush off Danny, 'she knows, she's known me for only ten minutes and she's worked it out already.' Janet hears the thought as Danny focuses on that one thought, 'I have to escape, don't want to be torn apart molecule by molecule."

"From the look on your face I take it I'm right," another wave of panic, "relax, I'm not going to hurt you, after all, you're a ghost, I'm unarmed, what, did you think I was going to hit you with my book?" Danny smiled sheepishly.

"So, you're not going to tell my parents?"

"Goodness no, from what I can tell, they are a few sandwiches short of a picnic, it would be counterproductive." Danny visibly relaxed, "by the way, did you choose the name Inviso-Bill?"

"No, the news gave me that one; I prefer Phantom or Danny Phantom."

"Can I ask some question?"

"I guess," Danny said rubbing the back off his neck.

Janet reached into her backpack for her wand, "legilimens," Janet whispered as she slipped into Danny's mind she passed an impressive array of mental defences until she reached the part of his mind that knows truth from lies, she finally retrieved a muggle ballpoint pen and a sheet of parchment. "Why would a ghost pretend to be human?"

"I'm not a full ghost, I'm a halfa, one of only three, half ghost, half human," Danny was telling the truth. "A few months ago my parents built a ghost portal in the lab downstairs, it broke, but my friends convinced me to go inside and have a look, I accidently pressed the on button which was on the inside, this turned me into a halfa, and let out the other ghosts, which I now have to fight every night." Danny had told the truth the whole way through, Janet furiously scribbled down notes, "what if my parents find one of your notes, won't I be in a lot of trouble?"

Janet laughed at this, "I would be very surprised, my notes are in Ancient Greek, now, next question, why did you suddenly start stealing valuables a couple of weeks ago?"

"Oh, there was a ringmaster called Freakshow, at a traveling circus who had a staff that could control ghosts, he made me steal things, but because I'm a halfa its grip wasn't absolute, I broke free and broke the staff," Danny was telling the truth.

When Janet finished writing there was the sound of two sets of footsteps, one pair were heavy they sounded like combat boots. Janet stretched out her legilimens spell, they were a boy and girl, both Danny's age, "two people, one in combat boots," Janet said, Danny blinked in surprised.

"That'll be my friends Sam and Tucker."

"Hi," the girl, Sam said before seeing Janet, Sam was a goth, she was about the same height as Danny, she had short, black hair which was tied into a high ponytail. She wore black choker around her neck and a black tank top exposing her midriff with a purple oval in the centre, a black skirt with a green crosshatch design, purple leggings, and black combat boots. She also has a pair of black bracelets around her wrists, she has purple lipstick, and violet eyes, her eyes narrowed "Danny, who is that and why is she sitting on the counter?"

Janet jumped down from the counter and smiled at her, "hello, I'm Janet Harker," Janet held out her hand which Tucker shock, but Sam refused, Janet blinked, "have I done something to offend you?"

"It's not you," Tucker said, Tucker is African-American, with black hair, turquoise eyes and thick glasses, he wore a long sleeved yellow shirt, a black belt, green cargo pants brown boots and a red beret, he is also carrying a backpack and a PDA. "Sam's in a bad mood, her parents are trying to get her to make friends with people who they deem appropriate, and Sam is angry about it because wickle Sammykins wants to rebel."

"Shut up Tucker," Sam swung a fist a Tucker, who ducked. Sam sighed, "sorry I shouldn't take it out on you Janet, it's not your fault, it's my parents."

Janet smiled, "it's okay."

"Anyway, Danny, we came over to tell you Danielle's been seen back in town."

"Who's Danielle?"

"Danny's," Sam paused.

"Clone," Sam and Tucker gasped, Janet started scribbling again, "she worked out who I was in like five minutes."

"And you haven't told anyone?" Sam asked sounding rather surprised.

"No," Janet said blowing one of her hairs into place, "he's not a bad ghost, so I saw no need to tell."

"You still haven't told us, why you're here," Sam said.

"Dad was asked to deal with the ghosts, including Inviso-Bill."

"So, why aren't you doing anything?"

Janet raised an eyebrow, "like what?"

Sam shrugged, "getting someone, because you know, Danny's a ghost, and your family is here to hunt ghosts."

"But, I'm convinced Danny's innocent, so why would I want to harm someone who's innocent? There are much easier ways of dealing with this."

"Like?"

"Proper procedures, gather evidence, question witnesses, find an actual crime."

"What do you mean?"
"Well, as far as I can tell Danny hasn't committed any crimes."

"Tell that to the Guys in White, they say it's a crime for just being a ghost."

"Who are the Guys in White?" Janet frowned.

Danny sighed, "the Government's secret ghost hunting division."

Janet frowned, "that should not exist."

"I wish it didn't, but no such luck."

"Janet," Thom called, "we're going, say good bye."

Janet jumped down from the counter, "well, it was nice meeting you, I'm sure we will see each other around the town again, have a good day."

"And you," Tucker said, Janet shook all their hands again before walking into the hall.

"If you need any help, I will gladly lend you some Fenton ghost hunting gear," Jack said, holding onto the Fenton Freak Slimer.

"If it's all the same to you, I'll use my own, I have more experience with it."
"Hmph," Jack harrumphed as he shook Thom's hand.

"Anyway, we should be on our way, thank you for everything Mr Fenton," Thom said as he pulled on his jacket and walked out the door.