Violet and Jessie begin an adventure when they journey to Centerville to keep Aunt Jane company on the family ranch.

One warm night four children stood in front of a bakery. No one knew them. No one knew where they had come from. Henry, Jessie, Violet, and Benny used to live alone in a boxcar. Now they have a home with their grandfather and are spending the summer in a lighthouse on the New England Coast. Jessie sees a mysterious woman walking on the grounds of the lighthouse late at night. Watch, Jessie's dog, wakes up growling almost every evening--at midnight....

Recounts the adventures of the Alden children as they solve the mystery of the old schoolhouse in Port Elizabeth.

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.

Six children help solve the mystery of a missing spyglass that has kept two brothers feuding for years.