Jimmy Kudo, the son of a world-renowned mystery writer, is a high school detective who has cracked the most baffling of cases. One day while on a date with his childhood friend Rachel Moore, Jimmy observes a pair of men in black involved in some shady business. The men capture Jimmy and give him a poisonous substance to rub out their witness. But instead of killing him, it turns him into a little kid! Jimmy takes on the pseudonym Conan Edogawa and continues to solve all the difficult cases that come his way. All the while, he's looking for the men in black and the mysterious organization they're with in order to find a cure for his miniature malady.

Conan wakes up in the hospital, the victim of a gunshot wound...and things just go downhill from there. Has Rachel finally figured out that Conan and Jimmy Kudo are one in the same?

But the drama really builds when a real-life murder interrupts Rachel's school play...and a familiar teenage boy steps out of the wings to tackle the case. It's not a dream! Not a flashback! Not an imaginary story! Jimmy Kudo is back!