在一次事故中失去母亲后,一个十几岁的少年和她的父亲欢迎一个远道而来的表妹来到他们的家。这位精神病患者希望称这个家庭为她自己,因此策划了一个诡异的计划,以重现她从未经历过的舞会。After losing her mother in an accident, a teenager and her father welcome a distant cousin into their home. Hoping to claim the family as her own, the psychopath hatches a devious plan to recreate the prom she never experienced.