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 towards Trina, things get complicated as they try to find out who she likes.