Eleven-year-old Melody Vega and her family visit Glacier National Park every summer, but this year Mel comes face-to-face with a terrifying grizzly bear.

When a Cold War diplomat dies under suspicious circumstances and is promptly declared a mole, the man's wife relocates to a remote Scottish island, where her steadfast youngest child discovers a marooned grizzly bear and uncovers truths about his father's activities.

Ol' Mama Squirrel has raised many babies and kept them all safe from predators, but she may have met her match when a determined grizzly bear threatens to eat her entire family tree.