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.

Sent to live in their distant cousin's gothic mansion in the English countryside, Mog Winter and her long-lost brother Nick find themselves in the care of two scary servants and surrounded by supposed accidents and strange deaths.

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.

A collection of five novels that follow the adventures of Mandie, a girl growing up in North Carolina around the turn of the twentieth century, who enlists her good friends Joe and Celia in helping her solve mysteries.

A collection of five novels that follow the adventures of Mandie, a girl growing up in North Carolina around the turn of the twentieth century, who enlists her good friends Joe and Celia in helping her solve mysteries.

The Alden children begin receiving mysterious fortune cookies, each holding a clue from an anonymous riddler.

The Boxcar Children investigate when strange happenings at the radio station cause people to believe the place is haunted.

The Alden children travel on a Mississippi paddle-wheel steamer to visit an old family friend in his cabin near Hannibal, Missouri, and try to discover who is responsible for the mysterious activities near the house.

While sightseeing in San Francisco, the Boxcar children uncover a mystery involving fishing boats and sabotage.

K. Westree arrives at Bellsong Academy, where she hopes to leave her past as a cat-burglar behind, but she quickly learns that the school contains a hidden treasure left by its founder, and as she resumes her old habits, she starts to question whether she really wants a normal life.