Someone is trying to put Aunt Jane's motel out of business, but the Alden children aren't going to let that happen.

A young Canadian visitor helps the Alden family solve a mystery involving a lost coin collection.

The Alden children, isolated in a storm at a small bus station, are led into a mystery centering on a polluted river.

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.

The children, who are spending the summer in a lighthouse on the New England coast, are disturbed by a mysterious woman walking the lighthouse grounds. Jessie's dog Watch wakes up growling almost every evening at midnight, and Henry finds a puzzling note in the sand.

"The Aldens spend the summer on their aunt's ranch! The ranch is a beautiful place, but it's also the source of trouble between Aunt Jane and Grandfather. As the Boxcar Children explore the land, they make an amazing discovery. Will it help mend Aunt Jane and Grandfather's relationship?"--Publisher's description.

The Aldens search for carousel horses that have disappeared from an amusement park.

Summer vacation on an almost private island gives the Aldens a challenge. Henry, Jessie, Violet and Benny used to live alone in a boxcar. Now they have a home with their grandfather and are spending the summer on their own private island. There is a mysterious stranger on the island with a secret--but that's not the only surprise in store for the Boxcar Children.

Relates the exploits of the four Alden children as they locate a missing man. The Boxcar children are determined to solve the mystery that surrounds an old yellow house on their grandfather's property. Strange things have happened in that house where long ago a man disappeared.

While on a bicycle trip to their aunt's farm, the four Aldens help solve a mystery.