Seventeen-year-old Jimmy Kudo is a prodigy boy detective. During an investigation, two thugs in black force feed Kudo an experimental poison that unexpectedly turns him into a little boy instead of killing him. To hide his identity as he searches for the organization that tried to kill him, Kudo takes the name of Conan Edogawa. His childhood friend and classmate, Rachel Moore, and her hare-brained private investigator father take Conan in. Trapped in a puny body, Conan solves crimes, sometimes aided by the kids in the Junior Detective League and the inventions of his old friend, Dr. Agasa.