Gertrude Chandler Warner

After a series of strange events, the Alden children must solve a mystery to help their friend Mike and his family.

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

A family, snowbound in a vacation cabin, discovers adventure in surrounding wild life, three children they find in the snow, and a search for a lost recipe.

Henry, Jessie, Violet, and Benny--four children who used to live alone in a boxcar and now reside with their grandfather--arrive at Camp Seagull overflowing with excitement, but they soon realize that some of the other campers are not above cheating in the annual camp Olympics.

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 visiting the Florida Keys, the Aldens encounter suspicious characters, strange incidents at night, and a plot to steal valuable coral.

The Aldens investigate when a new store called the Game Spot opens in town and the neighboring shops are robbed.

The Boxcar Children try to find out if someone who makes tapping sounds at midnight plans to sabotage a convention for inventors.

When their grandfather arranges for them to spend two week at Sunny Oaks, the four Alden children enjoy settling into the routines of farm life but become suspicious about a mysterious horse locked in the stables.