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Eleven-year-old Ben recalls his relationship with his unusual friend Ring, who walked into the river and disappeared one day.

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.

The Landon family makes a trip to Death Valley National Park accompanied by a mysterious new foster child, fourteen-year-old Leesa Sherman.

The disappearance of the seven-year-old daughter of a Brooklyn family casts suspicion on a juvenile offender from Harlem who has recently come to live with them.

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

While lost in a tunnel at Carlsbad Cavern, thirteen-year-old Jack, eleven-year-old Ashley, and their eight-year-old foster brother, Sam, think bats and darkness are their worst problems, until they stumble across thieves.

Jack Landon's sister is held hostage by people asking for Leesa, a fourteen-year-old foster child staying with his family, and they are all led to a missile testing ground in Death Valley National Park, where bighorn sheep have been mysteriously dying.

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.

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.

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.