When Angela's husband and son die after a car crash, she seeks justice against the doctor who operated on the pair. Desperation and obsession lead Angela into a paranoid state, dissociating her from reality. She follows the doctor day after day: behind the anonymous facade, the man hides a parallel life of depravity and murders committed together with his colleagues. Discovering these new horrors, Angela turns to dark otherworldly forces to find the strength to eliminate the killers.