When Trina’s bicycle is stolen, Marty and Remi gear up to solve the case. Once they start their investigation they are both stunned that the evidence leads them to the doorstep of their new elementary school teacher. Mr E proves to be quite resourceful as an opponent, and the new girl at school, Ida, seemingly foils their attempts to catch the school thief. When Marty discovers that he and Remi share the same feelings toward Trina, things get complicated as they try to find out who she likes. For Marty, friendship, loyalty, and trust suddenly seem less straightforward when the mystery of girls is involved.

The sequel to The Mystery of the Frozen Brains, winner of the 2005 Edmonton Book Prize, and The Mystery of the Graffiti Ghoul, which was nominated for the 2007 Arthur Ellis Award.