Agnes Hatcher is the most brilliant and brutal psychopath at Darden State Hospital for the Criminally Insane. In her twisted fantasy life she shares an unbreakable karma with the man she believes to be her devoted lover. But this weekend, Trey--psychiatrist Trey Campbell--has abandoned her to take his family on holiday. And Agnes is feeling very unforgiving. Now, darkness has fallen on the Campbell's isolated vacation retreat, and a diabolical game of wits is about to begin. Because what Agnes has planned for Trey and his family is beyond anything any of them can imagine.