The Boxcar Children investigate when everything seems to go wrong for the Greenfield Museum as soon as the Museum displays a four-thousand-year-old ancient Egyptian mummy.
The Boxcar children travel to Maine, take canoes into the wilderness and live in a house exactly like the one on Surprise Island, except the Maine house is brown, not yellow. Soon they are trying to untangle the mystery of the two houses.
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.
When the Aldens visit Yellowstone they discover a map showing the way to an old cabin where gold is supposedly hidden, but they encounter lots of interference in their attempts to hike the trail.
