B"SD

Neither Assassin's Creed, nor Harry Potter belong to me.

Hi! I've kind of stepped outside my usual course with this story. I actually split the writing of this crossover with a friend of mine, who is posting it on Deviant Art. She's the expert on Assassin's Creed, I provided the Harry Potter stuff. But that's not to say that we didn't write for the others' characters; it's pretty much an even split. We had a lot of fun writing this. It started as a few brief lines in an email and sort of exploded from there. We hope you enjoy it.

Chapter One

The building was made of concrete, short and squat-looking, sitting unobtrusively between its neighboring buildings. Hermione glanced down at the parchment again, checking the address against the number etched in the cement wall. "This seems to be the place," she said with a sigh.

"Doesn't look like much, does it?" Ron said, casting a wary eye over the structure. Honestly, the front façade could rival Grimmauld Place for its bleak impression. "And Lupin is sure that these people are going to help us?"

"That's not what he said, at all," Hermione said. "Weren't you listening?"

"Save it," Ron said. "Just go over it again."

"Okay," She said, pushing her hair out of her face. "These people- who call themselves Assassins- are being targeted by the Death Eaters and the new group that has allied itself with them, right?"

"Yeah I got that part."

"So we're here to see if the Death Eaters have a reason to be attacking them; information, powerful magical artifacts. Things like that. Harry, where are you going?" While Hermione had been speaking, Harry had walked around to the side of the building, inspecting the wall behind a bramble of sorry-looking bushes.

"I think there's a way in through here," he called, tracing the almost invisible crack in the wall with his eyes. "And as we can't get through the front…" he trailed off, gesturing at the boarded up doors. "Come on." With that, he gave the door an almighty shove, and stumbled into a dark stairwell.

"So let me get this straight..." Desmond said looking skeptical."This Voldemort guy can send you messages through the mark on your forehead?" The three newcomers had just finished explaining everything to them. Most of it sounded like gibberish. Honestly, a hidden magical community in the center of London? Desmond wasn't convinced, though it seemed that Rebecca and Lucy were.

"Yes," Harry said warily.

"Do you also pick up WIFI?"

"Maybe through his teeth," Lucy piped up.

"At least you aren't stuck with a gang of Americans," Shaun snorted, "I never have anyone to share tea with."

"What is it with you and tea?" Desmond snapped, head whirling to face Shaun.

"Wait, this is your hideout?" Harry asked cautiously, "So...who are you hiding from?"

"Your worst nightmare," Rebecca growled, not turning any attention from Baby, who had just recently started malfunctioning.

"Abstergo," Lucy replied curtly, "and who are YOU hiding from?"

"Oh, I dunno," Ron started with strained sarcasm, "the ENTIRE magical world?"

Shaun's tea came right out his nose.

"Oh grow up." Lucy snapped, fixing Shaun with a withering glare, watching him wipe himself off. "There's no use arguing over something like this- we're really all in the same boat here." The other six stared at her incredulously. She sniffed. "Of course, we're not going to mention the vast difference between a war that has lasted some twenty odd years and an epic, centuries-long conflict between good and indescribable evil."

"Cuz that would just be petty," Harry snapped with biting sarcasm.

"Exactly," she answered her voice dignified."We're not here to argue over who's making too much of a few men wearing dresses and waving wooden sticks around. No, siree. "

"You're right," Harry said, "after all, I've heard horrifying stories about how you suffer here. The stuff of nightmares, honestly." He turned to Ron, eyes wide. "Did you know that Shaun here has been forced to even go so far as to drink tea alone?"

"Just thinking about it is almost enough to break a man." Ron said the telltale waver of laughter in his voice."Can you just imagine trying to endure that?"

"Impossible, really."

"You little brats!" Rebecca slammed her fist on Baby's delicate cushions, which put a damper on the point she was trying to make. The technician stood up, fists clenched and whirled around to face the wide-eyed teenagers.

"You think because you can wave a stick around and mumble some magic words-"

"Hey, hey," Desmond grasped Rebecca's arm firmly, "this doesn't have to get ugly!"

"No, honestly, let her continue," Harry approached the animus casually; "I enjoy being yelled at."

"I worked my heart out to get Baby working!" Rebecca cried, her voice thick with frustration, "then these assholes just prance on in and wave their little sticks and BOOM! The animus shuts down!"

An uncomfortable silence blanketed the room as Rebecca sniffed indignantly.

"Well, you don't have to get all upset about it..." Ron mumbled.

"Rebecca," Shaun drawled, "as much as I hate to blaspheme your precious, ah, baby- I hardly believe that it was their presence that caused the animus to malfunction...again."

"What are you suggesting?" Rebecca asked dangerously.

"Oooh, Shaun," Lucy winced, "tread lightly."

"Can I just ask what the er- baby does?" Hermione asked, her hand slightly raised. Rebecca looked scandalized.

"What does it do?" she repeated, hysterical. "It's only the greatest invention that there ever was! It's only the most ingenious, revolutionary piece of mastery ever imagined since the days of the great Leonardo himself!" She drew herself up to her full height of four ft, eleven inches, and turned, small and furious on Shaun. "And it DOES NOT malfunction!" She grabbed a wrench off the floor and stormed off to comfort her faulty brainchild.

There was a short silence.

Hermione turned to Desmond, who was staring shell-shocked after the young mechanic."So what does it do?"

"The animus," Shaun inhaled, steadying his somewhat shaken tone, "Is a wonder of modern science, enabling the user to-"

"Muggle science," Ron grumbled, "That's what I need, another lecture in muggle science."

"Please, Ron," Hermione tsked the bored red-head in annoyance.

"-view the memories of his or her ancestors," Shaun continued curtly, "via DNA strands."

"So let me get this straight," Harry rubbed his temples, "If I were to sit in that chair and hook myself up, so to speak, I could access the memories of anyone in my family bloodline?"

"Yes," Rebecca snorted, "Of course you could. Cuz it's not like WE'RE using the animus for anything IMPORTANT!"

"Even my father?" Harry asked softly.

"I don't see why not," Lucy nodded. A cry of pain disrupted the conversation as Rebecca shocked herself on one of the animus' many wires. The mechanic was then oddly quiet.

"Erm...Rebecca?" Desmond approached Baby nervously, "is...is everything alright?"

"Oh that wasn't good." Rebecca said quietly.

"What wasn'-" Ron began, but was cut off when all the lights suddenly went out, plunging them all into darkness. A sudden ringing silence indicated that the many whirring, blinking and buzzing machines around them had stopped.

"What did you do?" hissed Shaun, rounding on Rebecca. She shook her head, and then realized he wouldn't be able to see her.

"It wasn't me," she whispered instead, "baby runs on a completely different circuit. Something's up." She hadn't even finished her sentence before distant voices could be heard outside the shelter. Without prompting, every single one of them drew various weapons.

"Templars" hissed Lucy.

"No," Harry whispered, ears straining. "Those are Death Eaters."

"How do you-"

"I just know." He said shortly, the scar on his forehead burning painfully. He rubbed at it, trying to think."We've got to get out of here."

"They must've tracked us here," Hermione whispered fiercely.

"Who tracked what where?" Desmond replied angrily, though equally as quiet.

"Hold on guys, I'm gonna initiate Baby's backup protocol," Rebecca hissed, working cautiously through the thick darkness.

"No, don't-" Harry tried to stop the Assassin but was cut off by an incredible burning in his forehead- the door of the apartment had been blown clean off its hinges.

"Backup would be nice, NOW, Beccar!" Shaun whispered anxiously.

"Got it!" Rebecca yelled, whooping as the animus lit up with an eerie blue light.

"There!" An unrecognizable voice yelled, pointing to the now illuminated group with his wand. The Assassins and Wizards were quickly surrounded by a circle of dark-robed sorcerers.

"They ARE Templars!" Desmond growled, his hidden blade sliding smoothly down his sleeve. He would've lunged, but Lucy grabbed his arm. Glancing around- he saw Rebecca had grabbed Ron, Shaun had grabbed Harry, and Hermione had grabbed Desmond's other arm.

"You're shitting me!" Desmond cried before the entire room was purged in whiteness.