John and Laura Taylor are desperate for a child. After desperately trying every other option, the young couple finally hire a surrogate. After much searching, they meet Anna, who at first seems like she is exactly what John and Laura have been looking for. After her boyfriend is charged with beating her up, Anna convinces John and Laura to let her stay with them until the baby is born. Things start out normally enough, but as time goes on, Anna becomes more and more obsessed with John and the life that he leads with Laura. The couple end up being caught in a deadly cat and mouse game with Anna, with the life of their child on the line.
