The latest installment in the beloved Cam Jansen mystery chapter book series from David A. Adler! Aunt Molly has entered a joke-telling contest at a local comedy club and Cam， her best friend Eric， and Mr. Jansen are in the audience to watch her perform. The prizes are exciting， but the competition is stiff there’s a prop comic， a knock-knock joker， and more! As the show starts， Cam notices that one of the prizes， an engraved silver plate， has disappeared. Suddenly， everyone in the club becomes a suspect. Can Cam solve the mystery of the missing prize or will she be laughed out of the Joke House?