Dr.SamanthaGoodman,anattractivepsychiatristinherthirties,joinsherhusbandandsisterforaweekendatawintercottagewhenanunexpectedguestarrives.HarlanPyne,aviolentsexualoffender,isconvincedthatSamanthaconductedunethicalexperimentsonhimwhileshewashisdoctor.Withtheassistanceofhistroubledyeteagerprotege,HarlanforcesSamanthaandherfamilytoparticipateinaseriesofnightmarishgames.Onthisnightofterror,escapeisnotanoption,truthguaranteesnothing,andrevengewillnotnecessarilybesweet.