While sightseeing at the Alamo, the Boxcar children investigate the disappearance of a priceless ring from the Alamo museum.

When the Alden children set out to solve a jewelry store robbery, they find they must also deal with a mysterious thief who steals their favorite cereal.

The Aldens become involved in a community theater production of "The Wizard of Oz," which is systematically and mysteriously being sabotaged.

When they help out at a guide dog training school, the Alden children meet several people who seem obsessed with a particular dog named Ginger.

On a camping trip to Arizona with their grandfather, the Alden children search for a lost gold mine.

While exploring the caves around Dragon's Mouth Cavern, a series of unusual and somewhat frightening events convinces the Alden children that someone does not want them around.

While on a cruise with their grandfather, the Alden children help discover who is behind the mysterious troubles of the ship--disconnected phone lines, engine trouble, a man overboard--and still have fun sightseeing, eating, and swimming.

While visiting a friend of their grandfather's on Sullivan's Island, off the coast of South Carolina near Charleston, the Boxcar Children encounter mysterious activities related to rumors of a buried pirate treasure.

While canoeing and backpacking near Timberwolf Lake, the Aldens receive strange warnings to stay away from the area and stumble upon clues to a missing cache of stolen coins.

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.