A/N: Yes, I know. I start fanfics, never finish them. I hope this won't be the case with this particular fanfic! I love both fandoms and am obsessed with them right now, so hope you enjoy it! I'm really surprised no one's done a crossover with this. I've seen it on LJ, but just a one-shot. Maybe I'll start something new?

Summary: Consulting Detective Sherlock Holmes has been asked by Juzo Megure, Inspector in Japan, to look up on the disappearance of a boy named Shinichi Kudo. The seventeen year old boy, also a detective, was last seen with his friend Ran Mouri, and has only been heard of since through phone calls on certain cases, but asking that his name be kept out of the reports. So, Sherlock and John travel to Tokyo, in search of a missing teenage detective, only to get into a little more than they first intended.

Warnings: Slightly AU, no real spoilers for season 2. I do apologize for any OOCness, this is my first Sherlock fic at all. There might be Johnlock...haven't decided. If there is, it won't be too graphic.

Disclaimer: I do not own Detective Conan or BBC One's Sherlock. If I did, this would so be the series.

-3-

The Disappearing Act

Chapter 1: Off to Tokyo

-3-

"Who was that?"

John Watson looked up from where he'd been sitting in the armchair, momentarily pausing in typing up his blog. His flatmate, Sherlock Holmes, had been talking to someone over the phone, which was strange, since the other had said on more than occasion he preferred to text. It must have been important.

"A rather interesting case," Sherlock said after pocketing his mobile.

"About?"

"A missing teenager."

"And that's interesting to you because?"

"Because apparently this teenager, seventeen, is also a detective. Very well known in Japan." At that, John raised an eyebrow. So Sherlock's name was heard of world wide then. "He was last seen with his girlfriend - sorry, no, just friend, at their local amusement park. He'd solved a case of a beheaded man on a roller coaster ride, then seemed to vanish. She said she has only heard from him since through texts, emails, and the occasional phone call."

"Maybe he's... really busy?"

"With what? A high-school detective can't get that many cases and he'd be busy with school," Sherlock said sighing. "Though that's the excuse every time he calls, he's busy on some sort of case."

"And she's never seen him since? No one has?"

"Not once. And whenever he's been involved in a case after, he's asked the Inspector there to keep his name out of reports."

"That's... odd."

"He's obviously in some sort of danger. But his parents, who travel around the world seeming to be carefree, don't seem to be that concerned! Kudo's - the missing boy - neighbor, said that no one's gone in or out of his house since that night either, except for the girl friend once or twice to see if he ever came home."

"And... he never did."

"Obvious."

"If it's been so long since it happened, why call you now?"

"The Inspector is concerned, I suppose. He finds it strange that no one really seems to be too worried about him. Not his parents, not even his neighbor."

"So, I guess then, we're going to Tokyo?"

"Of course. Wouldn't miss this for the world!"

-3-

When consulting detective Sherlock Holmes and John Watson arrived in Tokyo, Japan, in the Beika district, it was certainly not what they expected. They first went to the Tokyo Metropolitan Police Department, talking to a rather big man dressed in mostly orange, cap and all. It was the man he'd been talking to on the phone a few days ago, Juzo Meguire. They'd been informed all about the missing boy, known as Kudo Shinichi.

"He's called the Detective of the East. He's similar to you, Mr. Holmes. Brilliant mind, solves cases that have most of us stumped. But lately, like I said... he's wanted his name to be kept secret. When I stumbled upon Doctor Watson's blog -" At that, Sherlock sighed. Of course, the blog. "-I hoped you'd be interested enough to help me find the boy. Stranger, no one seems really concerned, except the girl he was with that night."

"That's who we should start with then," Sherlock said quietly. John was looking back and forth between the two, somewhat stunned but he knew he shouldn't be surprised that Sherlock could speak and read fluent Japanese.

Megure nodded. "Yes. Here's the address, you'll notice it right away. It stands out quite a bit." He handed them a piece of paper...

...and that's how they arrived at Mouri's Detective Agency. When they first knocked, no one answered, so John tried again.

"He said they should be here, right?" John asked.

"Yes."

It wasn't who they expected to open the door at all. A rather small boy, maybe seven or eight years old, looked up at the two of them, big round glasses covering his blue eyes. Short brown hair that sported a cowlick and what was more than likely his school uniform complete with a red bowtie described his appearance.

He looked a bit started to see them, but soon smiled and yelled upstairs. "Oji-san, wake up!"

-3-

A/N: Continue? Like it, hate it? Any ways to improve? I hope everyone was at least in character. Short chapter I know, but it'll get longer, promise!