The Growling Bear Mystery: The Aldens love exploring the many hiking trails around Yellowstone, especially Lost Cabin Trail. But suddenly, the trail is closed because of bear activity, and then the map disappears! Could someone be trying to keep the Aldens away from the trail? It's a mystery — and the Boxcar Children are going to solve it!
The Mystery of the Lake Monster: When the Aldens arrive at Lake Lucille, they're excited to explore the forests and lakeside paths. Soon, however, rumors begin spreading about a monster in the lake. The Aldens meet a scientist who has been studying lake monsters. One night, when they hear strange noises outside, they wonder — is there really a monster in Lake Lucille? It's up to the Boxcar Children to find out!
The Mystery at Peacock Hall: The Aldens are determined to help their cousin Althea keep her beautiful home, Peacock Hall. Maybe they can find the mysterious treasure rumored to be hidden there. However, when a face appears in Jessie and Violet's window and the gardener, Tate, seems to be hiding something, the Boxcar Children realize there may be lots of mysteries to solve at Peacock Hall!