Jill Parrish (Amanda Seyfried) comes home from working the night shift to discover that her sister Molly has suddenly disappeared. Convinced that Molly has been abducted by the same serial killer from whom she escaped just a year before, and that by sundown Molly will be dead, Jill embarks on a break-neck ride to rescue her. Racing the sinking sun in a heart-pounding chase, Jill has only 12 hours to find the killer and save her sister.