Disclaimer: Gosho Aoyama owns Detective Conan/Case Closed, because if I owned it, I obviously wouldn't be here writing fan fiction. *Sigh* And Ai Haibara would be the main character, too...

The story starts here...

"The antidote, Kudo. Here it is."

{Prologue}

Mouri Ran was walking home, alone. She had been at Sonoko's house before. Ran didn't notice the black car trailing her, until it was too late. Two unfamiliar men dressed in black trenchcoats got out, tackled Ran to the ground, dragged her into their car, and drove off.

----

"Haibara?" Shinichi whispered urgently into the phone. "Are you there?"

"Yes," said Ai, after a pause. "So what you mean is that Ran hasn't come home yet, or hasn't been answering the phone, and you're worried about her."

Shinichi fumed. Trust Ai to make what he had to say sound so insignificant and unnecessary! Ran really wasn't home, and he was almost sure she had been kidnapped. He had traced her route, and found tire marks along a stretch of road, and a clump of long chocolate hair snagged onto a fence. Not to mention Ran's mobile phone dropped on the ground.

"Okay," he heard Ai say. "I was going to look into the Black Organisation anyway, so I'll see if Ran is there." Then the phone hung up.

Shinichi stood for a minute before realising what Ai had said. Did she mean she was going to the Black Organisation headquarters? No, he thought, shaking his head, Ai wouldn't do such a foolish and dangerous thing. Not without him. Right?

----

Ai raced through the streets on Conan's skateboard. Too bad he left it in Professor Agasa's house, so she thought she'd better make use of it. To top off the look, she had on Conan's clothes, the mask voice tranformer in case she had to speak [A/N: I don't know what you call it, that was the translation on the website I read Detective Conan manga], and a wig, which looked exactly like his hairstyle. In any case, she had to do this. And she had to be quick before she changed her mind.

She knew where her destination is. She knew what she had to do. She knew how she was going to do it.

And she was NOT chickening out.

Ai reached the Black Organisation's headquarters with a clear mind. She hid Conan's skateboard in a bush and sneaked into the building through a side exit.

So far, so good.

She navigated her way through the not quite dark, yet not quite well-lit labyrinth-like corridors which snaked everywhere and criss-crossed. She started to make her way to the laboratory she worked at before she relocated, but then remembered Ran. She honestly didn't know where she would be, and decided to follow her gut instinct.

Suddenly she heard a cry, and "Where is this?" and "Let me go!" Ran must be near! She ran as fast as her child body could carry her, and sure enough, there was Ran, struggling against two men in black trenchcoats. She was about to approach when she felt a hand on her shoulder.

"Where are you going, kiddo?" a voice growled. Ai gave a start. Slloooowwwlllyyy she turned around. Oh no! It was GIN!

Calm down, calm down...

Ai forced herself to breathe slowly. Then she remembered Ran, and herself disguised as Conan. She had to pretend that she was here only for Ran.

"Ran nee-chan! Ran nee-chan!" she called out in Conan's childish voice, feeling thankful she wore the mask voice transformer. Ran swivelled around, and caught sight of 'Conan'.

"Conan-kun! WHAT are you DOING HERE?!?" Ran shouted, terrified that 'Conan' will be hurt.

"Oh, so you came for that bitch, did you?" Gin's cruel smile stretched, as his grip on Ai tightened. His voice became a venomous sugary-sweet. "How moving. A little boy here to rescue his nee-chan. Do you want me to tell you why we had to kidnap her, little boy? Do you?"

Ai gulped, staring defiantly at Gin. She already had an idea why, but Gin continued on.

"We have suspicions that this woman is involved with Kudo Shinichi," Gin said, his voice hardening. "If we use this woman as bait for him, then he will most likely come to her aid. And when he does, we will finish the job we failed to accomplish before." Gin smiled cruelly again, and faced Ran. "I'm sure you know what we're going to do."

"Kill him."

Well, there's the first chapter! Hope you liked it! Sorry, I try the best I can, but if you have ideas on how I can improve it, pleassseee tell me! It would be VERY appreciated! ;)