The Boxcar Children, spending the summer at Mystery Ranch with the Aunt Jane, try to help when their friend Mike Wood's house burns down and he is blamed for starting the fire.
The Aldens discover that one of Pikesville's little league coaches has been cheating all season, which is somehow related to a plan to raze the town's historic baseball field.
The Aldens stumble upon a new mystery to investigate when they discover that the fruits and vegetables they are helping grow in a local restaurant's garden are disappearing.
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.