The daughter of a brilliant but mentally disturbed mathematician, recently deceased, tries to come to grips with her possible inheritance: his insanity. Complicating matters are one of her father's ex-students, who wants to search through his papers, and her estranged sister, who shows up to help settle his affairs.
Kevin's mother struggles to love her strange child despite the increasingly dangerous things he says and does as he grows up. But Kevin is just getting started, and his final act will be beyond anything anyone imagined.