Gertrude Chandler Warner

At the same time that the Alden children's efforts to raise money for a new hospital wing are being sabotaged by nasty tricks, they find their attempts to befriend the new girl Beth frustrated by her strange behavior.

The Alden children plan to ride in their boxcar at the Greenfield Founders' Day Parade, but the newly refurbished boxcar is stolen a couple of days before the big event.

While helping run Jerry Taylor's general store, the Alden children investigate his mysterious employee Nancy.

The Alden children hunt for their late grandmother's necklace that has been missing for years.

The Boxcar children uncover a mystery on a train trip from Boston to San Francisco.

At an old library, the Alden children discover a boy who needs their help and a stranger who is after a valuable object they found in the library.

While canoeing and backpacking near Timberwolf Lake, the Aldens receive strange warnings to stay away from the area and stumble upon clues to a missing cache of stolen coins.

The Alden children travel on a Mississippi paddle-wheel steamer to visit an old family friend in his cabin near Hannibal, Missouri, and try to discover who is responsible for the mysterious activities near the house.

Benny wants adventure and finds it as he and the other Alden children help uncover the plan of those who would prevent ballooning from coming to Lloyd's Landing.