Gloria Skurzynski
1) Cliff-hanger
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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.
2) Wolf stalker
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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.
5) The clones
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Fifteen-year-old Corgan, having won the right to live on the Isles of Hiva for his role in winning the Virtual War along with teammates Sharla and Brig, soon finds himself raising the increasingly hostile clone of Brig, a young mutant genius, who died shortly after the war.
6) Buried alive
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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.
7) The Hunted
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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.
8) Ghost Horses
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Visiting Zion National Park with his family, twelve-year-old Jack encounters two mysteries, the strange behavior of a band of wild mustangs and the possibly sinister actions of his new foster brother, a Shoshone boy.
10) Valley of Death
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The Landon family makes a trip to Death Valley National Park accompanied by a mysterious new foster child, fourteen-year-old Leesa Sherman.
11) The revolt
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Sixteen-year-old Corgan has a mortal enemy in Brigand, a clone he raised as a baby, who has now aged to the equivalent of 16 years. Now they either have to fight in a Virtual War, or Corgan must escape, ideally with Sharla, Ananda, and Cyborg.
12) Out of the Deep
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Jack, Ashley, and their unreliable new foster sister set out to solve the mystery of why whales are beaching themselves at Acadia National Park.
14) The choice
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Tired and disillusioned, Corgan tries living a more peaceful life on Nuku Hiva, but soon must confront his nemesis, Brigand, for the last time.
15) Rage of Fire
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Jack, Ashley, and their parents visit Hawaii where they meet a Vietnamese boy who is going to live with his American grandfather whom he has never met, and are pursued by the Goddess Pele.
16) Devastation
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Earth's population has been decimated by disease, and fourteen-year-old Corgan, genetically engineered to be the perfect warrior, plays an important part in the impending virtual war alongside his partner, the beautiful Sharla.
17) Virtual War
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In a future world where global contamination has necessitated limited human contact, three young people with unique genetically engineered abilities are teamed up to wage a war in virtual reality.