Follow Sam, Egg, Gum, and Cat as they try to solve the mystery on their field trip to the carnival. The junior detectives are thrilled to go to a carnival: games, rides, funnel-cake--what could go wrong? Unfortunately, someone has stolen the electronic cards that serve as tickets and game-winning trackers, and the sleuths have to take the case to save their field trip fun. Readers will love being able to choose from 12 possible endings and following the crew as they get out of some tight scrapes and some close calls.