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.

As Conan searches for Rum, second-in-command of the Men in Black, suspicious figures seem to be everywhere. Who's the mysterious customer who helps Conan and Harley solve an attempted murder at Café Poirot? Why are masked men stalking Rachel's mom at her law office? And what's up with Conan's new assistant teacher, Ms. Wakasa, who seems clueless but shows signs of being smarter--not to mention better at beating up crooks who threaten her students--than she first appears? Conan may be able to solve every crime and crack every code that come his way, but some secrets are beyond even a detective's skills...