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.
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