Daniel, art professor, has a car accident which results into a paranoia. He gets better, falls in love with one of his students and they decide to move away from civilization to the house in the mountains. Their peace and quiet is disrupted by three men building a road nearby. They rape the girl, beat the husband and drown their child. What will Daniel do now? Will he get his revenge? Will his past affect him?

Un joven estudiante es asesinado por la banda de Los Puñales. Su hermana, la maestra de química Rosa, novia del agente policiaco Lince, se desespera por la pasividad de las autoridades y decide intervenir. Usa una motocicleta y un traje que le pertenecieron a su padre acróbata. Localiza a los delincuentes disfrazándose de cabaretera y va matando uno a uno.