The Boxcar Children have a chance to be in a real play - The Wizard of Oz! Jessie is chosen for the Cowardly Lion. Benny will play a munchkin. Even Watch has a part and all the Aldens are helping with the show. Then mysterious things begin to happen. Someone makes a threatening phone call and a costume is destroyed. Maybe the show won't go on - unless the Boxcar Children can solve the mystery before opening night!