A detective is obsessed with a killer named Patrick "Trick" Weaver, who massacred his classmates at a Halloween party in 2015. Although Trick was shot multiple times and presumed dead after escaping custody, a masked killer reappears every Halloween, suggesting the nightmare is far from over. As the body count rises each year, the detective must confront the possibility that the man he's hunting is either a supernatural being or part of a more elaborate and sinister plot.