Books in Mysteries in Our National Parks series

Grizzly cubs are disappearing from Glacier National Park, and the Landon family must figure out why! But for Jack, the real mystery is his sister Ashley's strange behavior. What was she doing alone in the woods so early in the morning? And why did she lie to their parents? Jack's efforts to unravel the truth lead to a pulse-pounding adventure that brings the Landon kids face to face with an enraged grizzly—as Jack and his sister suddenly become the hunted.

Wildlife veterinarian Olivia Landon has been asked to help find the source of the lead shotgun pellets that are poisoning the few remaining California condors in Grand Canyon National Park. After she announces a plan, Olivia receives a death threat on her laptop. The plot soon thickens to involve the Landon kids, Jack and Ashley, and the family?s temporary ward?15-year-old Morgan Rogers, a rebellious self-proclaimed anarchist and computer buff. Tension mounts when the e-mail threat is almost carried out and Morgan is the only witness. The following investigation leads readers on a trip through Morgan?s cyberworld connections and builds to a thrilling conclusion.

Wildlife veterinarian Olivia Landon and her family are in Maine, investigating the mysterious strandings of marine mammals on the rocky beaches of Acadia National Park. With the family is 14-year-old Bindy Callister, a temporary ward who has been bullied by her older brother. Jack, Ashley, and Bindy come upon a baby humpback whale stranded in a rocky tidal pool and barely alive. During the complex rescue operation that follows, no one notices when Bindy wanders off. By the time Jack and Ashley find her, Bindy is acting very strange. She knows who’s causing the strandings but is afraid to tell. Jack and Ashley must get her to talk before more lives are endangered!