An icebreaker is stranded in a winter storm during the longest, darkest Solstice night. Coast Guard Sanna Tanner leads the rescue team haunted by disturbing events. Sanna races to solve the mystery before she becomes the next target.
An alien takes the form of a young Wisconsin widow's husband and makes her drive him to his departure point in Arizona. Distrustful government agents, along with a more ambivalent scientist, give pursuit in hopes of intercepting them.