Schoolhouse mystery : The Boxcar Children are spending the summer in a tiny, quiet New England fishing village, and the Alden's are teaching! Caboose mystery : When the Alden's spend the summer riding on a train, they get to live in a train car once again and this time, they're staying in caboose No. 777. Houseboat mystery : The Alden's are spending the summer traveling on a houseboat, but someone is watching them and wants something on the boat.

Mystery in the sand: A friendly writer with a metal detector, the mysterious inhabitants of a tower house, and the discovery of a locket in the sand are ingredients for the Aldens' latest mystery. Mystery behind the wall: A young Canadian visitor helps the Alden family solve a mystery involving a lost coin collection. Bus station mystery: The Alden children, isolated in a storm at a small bus station, are led into a mystery centering on a polluted...

While visiting Chicago with their grandfather, the Alden children begin receiving mysterious clues to a treasure hunt. Includes related puzzles, games, and activities.