In a psychiatric sanatorium in California, a young man named Arthur undergoes painful electroshock therapy due to his supposed madness, which turns him into a pariah within the institution. Over time, Arthur discovers that he possesses an extraordinary power: he can kill using only his mind. After escaping from the sanatorium, he begins to use his psychic abilities to take revenge on those who have harmed him and whom he considers unjust.
As Arthur unleashes his fury against his enemies, a series of mysterious deaths begin to occur in the city. The police, baffled, fail to connect the dots and become trapped in a cat-and-mouse game with this supernatural killer. Meanwhile, the doctor trying to understand Arthur's mind gets embroiled in the plot, attempting to unravel the intertwined madness and talent of her patient.
With each murder he commits, an atmosphere of terror and confusion is unleashed, leaving everyone in a state of unease. As the story unfolds, dark secrets are revealed, and the line between justice and revenge blurs. Tension escalates as the characters struggle not only to survive but also to comprehend the monstrosity that can dwell within the human mind. The film spirals into an unsettling journey that keeps the viewer on the edge of their seat until the unexpected finale.