Gertrude Chandler Warner

Grandfather and Aunt Jane haven't spoken for years, but the children help them to once again talk to each other.

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.

The Aldens try to help a visiting Russian gymnast who is surrounded by mysterious people and events and who seems to have a secret.

The Alden children have an adventure as they journey along with the Little North Railroad in two cabooses rented for the summer by their grandfather. A children's tale of adventure and excitement recounting the exploits of the Alden family's summer trip in cabooses

While on a cruise with their grandfather, the Alden children help discover who is behind the mysterious troubles of the ship--disconnected phone lines, engine trouble, a man overboard--and still have fun sightseeing, eating, and swimming.

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

The Aldens start a business producing birthday parties and find themselves investigating a series of robberies taking place during their parties.

The Aldens participate in a three-day bicycle ride and soon find that someone seems to be intent on keeping others from completing the event.

The Alden children investigate the old boxcar where they used to live to find out if something that happened long ago is now haunting it.

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.