For more than fifteen years Police Lieutenant Kinderman (George C. Scott) has been haunted by the death of his friend Father Damien Karras. Now, on the 15th anniversary of the exorcism that claimed the priest's life, Kinderman's world is once again shattered when a boy is found decapitated and savagely crucified. It's just the beginning of a nightmare series of bizarre religious murders. The brutal murders bear the hallmarks of the infamous Gemini Killer... who died in the electric chair fifteen years earlier. But when a psychopath claiming to be the Gemini Killer reveals intimate, gruesome details that only the true killer could possibly know, Kinderman is confronted with a horrifying truth that he cannot explain... and that will shake him to the core.