Twenty years ago Danny Summer found his father hanging from the rafters on Christmas Eve. Ever since that night he has been plotting revenge. When Brian Hartwell moves into Jessica Michael's guesthouse, she has no idea that her new tenant has a deadly agenda to go with his new identity. Her daughter Laura doesn't trust him from the beginning but can't convince her mother that there's more to "The Perfect Tenant" than meets the eye.

特雷西的孩子不幸死了，这件事给她的打击很大。因为不能再生育，特雷西和丈夫商量请了一个代孕母亲。后者入住他们家里，将一直待到产下婴儿。然而特雷西却在此期间，饱受嫉妒心的折磨，最终做出了可怕的事……