A young boy comes back from a field trip in the woods with something inside him. His mother must resort to supernatural means to save her son and herself.

　　单亲妈妈卡拉平时忙于房地产经纪的工作，虽然非常疼爱唯一的宝贝儿子卢卡斯，但忙碌时却常常疏于照顾卢卡斯的交友日常。直到卢卡斯去了一趟森林的校外教学回来后，卡拉时常听到家里有其他人的嬉笑声，她逐渐发现宝贝儿子竟是一切异常的根源。