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 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.

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

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

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

The children are spending the summer on their own private island but there is a mysterious stranger on the island.

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

The Alden children are staying at the New England farmhouse where their grandfather grew up. There are many stories and legends about the old farm, and there's a woodshed near the house that holds a surprising secret... a secret that dates all the way back to the Revolutionary War!

While on a camping trip with their grandfather, the Alden children try to find out about the loud music and missing food that threatens to scare away other campers.

A family starts out on a one-day mountain climbing excursion that becomes very exciting. In fact, it becomes an adventure for the former "boxcar" family. They unearth some mysteries and have a fine time in the process.