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.

Private eye Richard Moore has found a new line of work: ghost-busting! Hired by a wealthy man who believes he's being haunted, Mr. Moore discovers that the ghost may not be real--but the threats of murder are. To stop the killer, Conan must uncover the truth behind a disaster that took place 13 years ago!

Then Conan helps a newscaster track down a persistent stalker, but the seemingly simple case may be more than it appears. Is Conan on the trail of another of the Men in Black?