"Henry, Jessie, Violet, and Benny used to live in a boxcar. Now they have adventures everywhere they go. At a lighthouse, the children find a mystery in the night!"

A series of practical jokes at a restored nineteenth-century farmhouse makes the Aldens wonder if the ghost of its builder is at work.

At the request of their distant relative Althea, the Boxcar Children arrive at her old Virginia mansion and investigate the mysterious incidents happening there.

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 staying at a hotel in New York City, the Aldens investigate a series of annoying pranks plaguing the management and guests.

While exploring the caves around Dragon's Mouth Cavern, a series of unusual and somewhat frightening events convinces the Alden children that someone does not want them around.

When their favorite pizza restaurant almost goes out of business, the Alden children try to help their friends stay open while they find out who is behind all their problems.

The mysterious disappearance of a reclusive neighbor's cat involves the Boxcar children in some complicated detective work.

When an elderly friend is injured, the Alden children offer to help him with his window-washing business in their small town of Greenfield and agree to help him solve a riddle that has arrived in a mysterious invitation.

The Alden children begin receiving mysterious fortune cookies, each holding a clue from an anonymous riddler.