The Gymnastics Mystery: Henry, Jessie, Violet, and Benny are happy to share their home with Katya, the young gymnast, and watch her practice for the big competition. When things start going wrong at the gym, it quickly becomes clear that someone is trying to ruin Katya’s chances of winning . . . but who? The Aldens want to help. The trouble is, Katya’s been acting a little mysterious herself — almost as if she’s got something to hide. But what? Can the Boxcar Children solve both mysteries before the big competition?

The Poison Frog Mystery: The Aldens discover an exciting new exhibit to explore at their local zoo. But disaster strikes when a pair of rare ferrets is stolen. Two California condors are the thief ’s next target. It seems the animals are being taken by someone who works for the zoo. But how can you stop a thief who has keys to all the cages? The Boxcar Children are determined to solve the mystery.

The Mystery of the Empty Safe: Cakes! Decorations! Party games and favors! The Alden children are having fun helping out at neighborhood birthday parties. But then, a house is robbed — its hidden safe emptied — while Jessie, Henry, Benny, and Violet are downstairs entertaining. When a second safe is robbed during a party, the Boxcar Children decide to solve the mystery.