When Taryn promised to scatter her wife's ashes at an alpine lake in the Sawtooth Mountains, she expected an easy out-and-back hike. What she gets is anything but.

It starts when she spots a human bone in the lake. Then there's a howling in the woods. But when Taryn sees something unexplainable moving across the river, she knows she's in danger. This thing is stalking her. Watching and waiting.

A clumsy fall leaves Taryn injured and easy prey. Now she's alone. Injured. Out of time.