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註釋Grizzly cubs are missing from Montana' s Glacier National Park, and the Landon family is 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? Challenging Ashley, Jack discovers she has been sneaking food to a 10-year-old runaway from Mexico. After listening to Miguel' s story, Jack decides to help too. The compelling plot builds to a spine-chilling climax as the kids run for their lives, desperately trying to escape an enraged mother grizzly who holds the key to the park' s present mystery. Includes a detailed park map.