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Twelve-year-old Jack, his younger sister, and the family's teenage foster child Troy go to Yellowstone National Park, where Jack's mother, a wildlife veterinarian, is investigating the report that wolves reintroduced to the park have killed a dog there.

While their parents study why wolverines are disappearing from Alaska's Denali National Park, Jack and Ashley are stranded in a remote area with their mysterious new foster brother when a hit man's bullet triggers an avalanche.

Jack, Ashley, and their unreliable new foster sister set out to solve the mystery of why whales are beaching themselves at Acadia National Park.

Christina, Grant, Mimi, and Papa find themselves in the middle of a mystery in Death Valley, California with Aunt Erin, a creepy castle in the middle of nowhere, a ghost (or not?), temperatures hotter than a Fourth of July firecracker, and more!.

Christina, Grant, Mimi, and Papa travel to Wyoming's Devils Tower and climb into a "towering" mystery involving Native Americans, precocious prairie dogs, fascinating footprints, Unidentified Flying Objects, and aliens?.

Fourteen-year-old Bindy Callister, afraid after discovering the truth behind the breaching of whales on the shores of Acadia National Park, must find the courage to share what she knows with her friends Jack and Ashley Landon, before it is too late.

The Landon family travels to Glacier National Park to investigate why grizzly bear cubs are disappearing and becomes involved with a ten-year-old Mexican runaway boy.

Twelve-year-old Jack, his younger sister, and the family's teenage foster child Troy go to Yellowstone National Park, where Jack's mother, a wildlife veterinarian, is investigating the report that wolves reintroduced to the park have killed a dog there.

Twelve-year-old Jack and his younger sister visit Mesa Verde National Park, where they delve into the park's history while gradually uncovering the mysterious past of their family's teenage foster child Lucky.