When ace high school detective Jimmy Kudo is fed a mysterious substance by a pair of nefarious men in black--poof! He is physically transformed into a first grader. Until Jimmy can find a cure for his miniature malady, he takes on the pseudonym Conan Edogawa and continues to solve all the cases that come his way.

A serial killer stalks a group of people taking shelter in a snowbound mountain church. Conan, Mr. Moore, and Amuro are on the case--but so is Wakita, the mystery-loving (and mysterious) sushi chef. Who will serve up the solution first?

Then the Junior Detective League goes on a trip to forage for wild vegetables, only to stumble on a fresh corpse. And when an antiques appraiser is murdered, Conan suspects the motive is a valuable Chinese plate. But with two forgeries at the crime scene, it's hard to identify the real antique or the real killer!