Dr. Samantha Goodman , an attractive psychiatrist in her thirties, joins her husband and sister for a weekend at a winter cottage when an unexpected guest arrives. Harlan Pyne, a violent sexual offender, is convinced that Samantha conducted unethical experiments on him while she was his doctor . With the assistance of his troubled yet eager protege, Harlan forces Samantha and her family to participate in a series of nightmarish games. On this night of terror, escape is not an option, truth guarantees nothing, and revenge will not necessarily be sweet.