When Loren meets Jack, she's sure he's the man she's been waiting for—a perfect husband and father for her young daughter. Shortly after their wedding, their plans to start a life together are put on hold when the couple receives word that Jack's father has died. In an effort to appease her new husband, Loren invites her mother-in-law, Coralee, to stay with them while she grieves. When strange things begin to occur just after her arrival, Loren questions how much she knows about the woman she invited into her home. One calculated move after the next, Coralee attempts to drive a wedge between Loren and her new husband. Jack believes his mother's strange behavior is just further proof she needs their help, but Loren isn't so sure. As Coralee's actions become increasingly sinister, Loren is pushed to her breaking point, and she realizes she must do whatever it takes to get rid of her mother-in-law for good.