The Great Detective Race: The local radio station is putting on the Great Detective Race, where contestants must solve riddles and search all over Greenfield for clues leading to the grand prize. The Aldens sign up, and soon they're following the riddles' clues all over town.
The Ghost at the Drive-In Movie: The Aldens are visiting a friend who owns a drive-in movie. The children love to eat popcorn in the car and watch movies under the stars. But one night the sound system starts playing loud music, and a couple of employees seem to be hiding a secret.
The Mystery of the Traveling Tomatoes: When the Boxcar Children help out in a local garden, they dig up one strange thing after another! First, the tomato plants seem to move every day. How can that be? Then the Aldens follow the clues to an unsolved bank robbery, and it's clear that a very big mystery is growing in Greenfield!