U.S. Marshal Mercy Brennan's life is in danger and her ex-boyfriend Deputy U.S. Marshal Mark St. Laurent is assigned to protect her, but when an unexpected ice storm arrives, they realize that survival may no longer be guaranteed.

U.S. Marshal Mercy Brennan followed in her father's footsteps in a law enforcement career. When she's assigned to a joint task force with the St. Louis PD, it puts her back into contact with her father-- and in the sights of St. Louis's most powerful gang. Mark St. Laurent, a Deputy U.S. Marshal and Mercy's ex-boyfriend, is assigned to get her out of town until they can guarantee her safety. When a freak ice storm strands them at a remote location and out of contact with the district office, the forces of nature combine with a deadly enemy closing in to put their lives at imminent risk.