The mystery on stage: 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!. The dinosaur mystery: The four Aldens like visiting the large old museum owned by their grandfather's friend. But then Jessie sees a huge, scary shadow moving in the room where the dinosaur skeletons are on display. And bonds from the enormous Tyrannosaurus rex disappear. The must find the missing bones and solve the mystery before an exhibit is scheduled to open-or there might not be a dinosaur exhibit at all!. The mystery of the stolen music: An orchestra is coming to town! The children ere excited to hear the orchestra play, to meet the musicians, and to learn how to make their own instruments. The orchestra is also displaying a very valuable old piece of music. But when it mysteriously disappears, it's up to the Boxcar children to find it!.