The Alden siblings are spending the summer on a ranch out West—and learning some mysterious secrets about their own family.

After they were orphaned, Henry, Jessie, Violet, and Benny lived together in a railroad boxcar. Now they have a home with their grandfather. He always helps them with their problems, but this time he has one of his own: his sister, Jane. She lives out West on a ranch all alone and needs someone to stay with her. Too bad she's so grumpy and eccentric that no one can seem to get along with her! She hasn't even spoken to her brother in years.

So this summer, the Alden kids are going to keep Aunt Jane company and help her with the chores. It will be an adventure—but little do they know their aunt is hiding a secret, and their visit will bring about some unexpected discoveries . . .