Case Closed, Volume 4 (by Gosho Aoyama)

Can Detective Conan crack the case.while trapped in a kid's body?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.Bloody murder is committed at a museum, reproducing a scene from a gruesome painting.Later, the men in black are back! Will Conan be able to come any closer to getting his old body back? Also, Conan's friends from grade school find a treasure map--but will it only lead them to a trove of trouble?