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.

At a revolving sushi restaurant, a food critic is poisoned. Who slipped cyanide into the buffet? Something's fishy about this crime, but Conan is on hand to serve up justice!

Then a man dies at a strange contest for men who share the same last name...and the chief suspect is George's dad! And Conan joins the hunt for a drag racer called the Silver Witch who literally drives people to their deaths...