Gertrude Chandler Warner

The Aldens go on a three day bicycle trip to raise money for their favorite park, only someone is meeing with the water truck and other supplies.

The Boxcar Children uncover a mystery when they compete in several contests at the country fair.

The children help out friends in their pizzeria, but wonder if someone is deliberately trying to shut them down.

When the Alden children and their grandfather visit the Everglades National Park in Florida to solve the mystery of a missing ranger, they discover that a panther provides.

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 family embark on a trip to an uninhabited South Sea Island. Mike Wood joins them for a holiday full of adventures planned by grandfather. On the island someone seems to be with them. Besides solving the mystery, they have a fine time living so far from civilization.

A meeting with Mike Wood sets off a series of strange events for the Alden children, who are visiting Mystery Ranch again.

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