在这部冰冷陌生人惊悚片中,15年前寡妇梅尔的3岁儿子在超市被人拐走,从此下落不明。多年后梅尔已忘却悲伤和自责,与男友丹尼开始新的生活。一个陌生青年马克突然出现在梅尔门前,声称自己就是梅尔失踪多年的儿子。梅尔起初不信,但马克讲起儿时记忆,展示身上的伤疤,终于令梅尔相信多年的梦想成真。丹尼却始终怀疑马克,去警局查证马克所讲的经历是否属实,发现很多疑点,此后丹尼便屡遭“意外”。在冰上钓鱼时丹尼跟马克对质,马克见事情败露,将丹尼推落湖中淹死在冰面下。马克企图继续欺骗梅尔和前来查案的警官,但最终被识破。马克凶相毕露,拿出锤子重创警官,还要活埋梅尔。危急时刻警官的父亲赶到,开枪射杀马克,结束了一切。
Mare's life is dominated by the kidnapping of her three year old little boy. After 12 years, she is pleasantly surprised to find Mark standing before her on the doorstep pretending to be her son. Her joy eventually turns into fear and panic after it becomes clear that the young man is a dangerous psychopath.