Jack's mother is investigating a cougar attack at Mesa Verde, but he cannot explore due to her foster child.

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.

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

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.

Originally published: Washington, D.C.: National Geographic, 2002.

For use in schools and libraries only. The Landon family makes a trip to Death Valley National Park, accompanied by a mysterious new foster child, 14 year-old Leesa Sherman.

Life-threatening accidents keep plaguing the Landon family as they investigate the mysterious deaths of white mustangs at Zion National Park in Utah. Even before they get to the park, Jack Landon knows that Ethan Ingawanup spells trouble. Things start to go awry after Ethan and his sister--two Shoshone kids--are placed in the Landons' care. The questions begin to mount after Ethan teaches Jack and Ashley the ancient Ghost Dance: Are all the hair-raising events just coincidental? Or is there some strange magic in the dance ritual? The answers await in the raging waters of a slick-rock canyon called The Narrows. The afterword by Lyman Hafen of the Zion Natural History Association discusses white mustangs and public lands in Utah.