Nancy, George, and Bess have been invited to an April Fool"s Day party at their new schoolmate"s house. It sounds like it"s going to be a lot of fun -- each guest is bringing a gag to the party, and the best prank will win a special prize. When two of the guests" fancy new electronics go missing, Nancy knows something"s up. Is this someone"s idea of a joke? The Clue Crew certainly isn"t laughing, and they"re on the case to find the missing gadgets.