Nine months into her pregnancy, Sarah Brady receives a phone call out of the blue from another expectant mother named "Sarah Brody." The woman informs her they have both signed up for the same gift registry, and due to their similar names gifts meant for Brady have mistakenly been sent to Brody's address. What seems to be an amusing mix-up is, in fact, a deadly trap. When Brady stops by the woman's apartment to retrieve the gifts, she is instead confronted...