Dr. Emory Charbonneau, a pediatrician and marathon runner, disappears on a mountain road in North Carolina. By the time her husband Jeff, miffed over a recent argument, reports her missing, the trail has grown cold. Literally. Fog and ice encapsulate the mountainous wilderness and paralyze the search for her.
While police suspect Jeff of "instant divorce," Emory, suffering from an unexplained head injury, regains consciousness and finds herself the captive of a man whose violent past is so dark that he won't even tell her his name. She's determined to escape him, and willing to take any risks necessary to survive.