Myra is a Manhattan psychotherapist. An astute woman and an excellent judge of character, she thinks she knows what she's getting when she hires a nanny. Her phobia-addled son has just moved home with his wife and child, and Eva, a Peruvian immigrant, seems like the perfect addition. But as Eva reveals more of herself, their felicitous arrangement turns ominous. Slowly and inexorably, the relationship becomes too close, too dependent-and, ultimately, terrifyingly destructive.