The Alden children go to spend the summer on their aunt's ranch out west where they set themselves the task of restoring the relationship between Aunt Jane and their grandfather.
Henry, Jessie, Benny, and Violet Alden, spending the summer out west, decide to investigate when their friend Mike's house burns down and he is blamed for starting the fire.
Four orphaned children, afraid to go live with their grandfather, set up housekeeping in an abandoned boxcar and are doing fine until one of them becomes ill.
