Melissa must find out what has killed everyone she's ever known-before it kills her. What would you do if you discovered that everyone in your house, on your street, in your town was dead? Then you discovered you weren't alone and whatever was out there was hunting you? Melissa Allen, a troubled teen under house arrest, is the only person left alive in South Dakota. After discovering the mysterious deaths of her guardians and hearing of the massacre on the news, she realizes that there are monsters out there. They are pretending to be human, and they ve have begun a door-to-door search for her. Melissa is unable to leave the quarantine zone, and has no help except for Homeland Security agent David Hood on the phone. Before the government takes drastic action, she must figure out what killed everyone and stop it from happening again. Or did Melissa herself, in a psychotic fit, murder her guardians and the rest of the apocalypse is happening only inside her mind?