A commercial airliner disappears without a trace. Stranded, injured, and freezing, what happens to the survivors next will haunt them forever. After breaking up a sex trafficking ring, FBI Agent Victoria Heslin wants nothing more than to visit the rescue shelter she sponsors, a trip that also offers a much-needed European vacation and a chance to figure out her new relationship with Ned. Comfortable in first class, she drifts off-only to be shocked awake when her plane crashes. Lost in an empty, frozen wasteland, Victoria and a few other survivors battle extreme temperatures, as each day brings more tragedy. One by one, the desperate group is winnowed down. The remaining passengers must decide if they'll stay with the wreck, waiting to be found, or brave the harsh elements and venture out in search of help. When Agent Dante Rivera learns of Victoria's fate, he puts all his energy and expertise into finding her plane, which seems to have vanished from existence. As he unravels a technological mystery and layers of scheming, he fears his worst nightmare will be realized: that he won't find his coworker and friend alive.