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.

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

The Alden family rents a houseboat to drift down the river, and encounters a mystery in the little towns along the river, involving a fast black car.

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

Two brothers take summer jobs at a department store where a series of peculiar events brings them under suspicion.

While helping run Jerry Taylor's general store, the Alden children investigate his mysterious employee Nancy.

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.

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.

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.

When the Alden children accompany their grandfather to the Snow Haven Lodge, a series of odd occurrences threaten to disrupt the annual winter games.