While she studies condors in the Grand Canyon a scientist's life is threatened, and the strange, hostile, teenage computer whiz in her family's foster care might be involved.

"A Dogg family and a Katt family are spending their vacations at Western Frontier Park fighting with each other when a youngster from each family becomes lost in the dangerous forest"--Title verso page.

During a family reunion at the Eastern Wilderness Reserve, adventurers and expert trackers Molly the katt and Oscar the dogg must outsmart the rule-makers when two of their cousins run away together.

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.

Christina, Grant, Mimi, and Papa find themselves in the middle of a mystery in Death Valley, California. There's 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 make their way to Mount Rushmore to check out the colossal carving of four presidents...and find a mountain's worth of mystery, history, precocious prairie dogs, quirky clues, befuddling Badlands, and one Crazy Horse!