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A thrilling suspense novel from the world’s bestselling thriller writer Two sisters have always stood together. Now, they’re the only ones left. In the shadow of Mount Hood in the US Pacific Northwest, sixteen-year-old Tennant is checking rabbit traps with her eight-year-old sister Sophie. The girls are suddenly overcome by a strange vibration rising out of the forest, building in intensity until it sounds like a deafening crescendo of screams. From out of nowhere, their father sweeps them up and drops them through a trapdoor into a storm cellar. But the noise only gets worse . . .