who's the new girl?

Ai Haibara was previously known as Miyano Shiho, the woman who made the poisson which made Shinici's body regressed. She used to work at the same organization as the assassin who gave Shinichi the poisson, but then the organization killed her sister for betrayal, and locked 18 year-old Miyano in a room. She dranked the poisson she made, and just like what happened to Conan, her body regressed to 6 year-old kid, therefore she managed to escape through a ventilation. She ran away to Shinichi's old house and now live with Prof. Agasa, and live as a kid alongside with Conan, Goerge (his Japanese name is Genta btw), and change her name to Ai Haibara. As the poisson wasn't fully finished, Ai herself doesn't know how to cure it, so its rather useless finding her since she never wants to tell Conan anything about the organization.

It's all in the comic and in Japan I think the comic has reached around vol. 60s. U guys should read the comic, they're really smart and all. Oh and they made the live action movie too, with a real actor playing Shnichi. the story was about a case before Shinichi become Conan. Many people think it's not as good as the cartoon series but for most girls (including me), it's just fine, esp. the actor playing Shinici =]P