Yellowstone National Park buzzes wtih rumors about a wolf attack. And a stalker edges through the trees, ready to kill. Unaware that they are in danger, 12-year-old Jack Landon and his younger sister, Ashley, have their hands full dealing with rough and rebellious Troy Haverson - the teenage foster child who's just come to live with the Landon family. From the opening moments at Old Faithful through the next 48 hours, the dramatic tension builds. Keen pacing allows for scenes of suspense, adventure, and tenderness as readers are caught up in the fate of three kids - and the wolf they've come to call Silver.