Adopting the pseudonym Conan Edogawa, Kudo hides his identity to investigate the Black Organisation. Later, Shiho Miyano, a member of the Black Organisation and creator of APTX 4869, tries to leave the syndicate after her sister’s death but is captured. She attempts suicide by ingesting APTX 4869, and like Kudo, is transformed into a child. She escapes and enrolls in Conan’s school under a pseudonym, Anita Hailey.
During a rare encounter with the Black Organisation, Conan helps the FBI plant a CIA agent, Kir, inside the Black Organisation as an undercover spy.
Ah Yeah.
This is what I was talking about.
P/S: It's funny how people die whenever Conan/Shinichi is around.
P/S 2: 600+ episodes and still, Ran hadn't figured out Conan's secret identity. Well, anime clichés, I can't argue.
Source: http://en.wikipedia.org/wiki/Case_Closed