Gertrude Chandler Warner

The Aldens are helping the museum curator set up an exhibit about life in ancient Egypt, but the longer they are around the exhibit's mummy, the more things go wrong.

When the Alden children join a group of volunteers to fix up an old house for senior citizens, they try to explain the puzzling behavior of their coworkers as well as investigate some unusual events.

The Aldens head to Ladakh, a territory in northern India, to help save the elusive and critically endangered snow leopard.

The Aldens try to help a visiting Russian gymnast who is surrounded by mysterious people and events and who seems to have a secret.

While visiting Michigan's Upper Peninsula to prepare their Great-aunt Sophie's big old house for sale, the Boxcar Children encounter a mystery involving a valuable ring supposedly hidden somewhere in the house. Includes puzzles and activities.