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 . . .
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