It was supposed to be just one night in the cabin: one night for Lottie and her brand-new stepsister, Jade, to try to get along. When a solar flare causes a massive blackout?no power or cell signal? Lottie knows they've got a long night ahead of them. Then, in the dark, someone else shows up at the cabin?a stranger named Alex, claiming to be lost and needing shelter from the coming snowstorm. But later that night, Lottie spies him in the driveway talking to two mysterious men in a pickup truck, and she's sure he's lying about why he's here. Before Lottie can find out more, a fire forces her, Jade, and Alex out into the blizzard, where they must rely on one another to get to safety?wherever that is. In the remote freezing Tahoe wilderness, they have to survive more than just the elements. Soon it becomes clear that Alex's accomplices are hunting for all three of them in a scheme that's gone too far and taken a chilling, deadly turn.