Published by The National Geographic Society

Grizzly cubs are disappearing from Glacier National Park, and the Landons are there to help figure out why.

But for 12-year-old Jack, the real mystery is his sister Ashley's strange behavior. What was she doing in the woods alone so early in the morning? And why did she lie to their parents? Jack is determined to learn the truth.

When it's ime to go to a briefing on the bear problem, Jack volunteers to stay at the campground and keep an eye on his sister. No sooner do his parents leave than Ashley disappears. When he finds her, she is not alone!

What happens next sets off a chain of heart-poinding events that bring them face-to-face with an enraged grizzly. Jack and Ashley run for their lives, as they become the hunted.

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