1866, during the so called “war against Paraguay”, in an isolated mountain. A young boy named Venancio kills a horned frog. Her mother Antonia believes in an ancient folk legend that foresees the horned frog being resurrected if he was not cremated. In this deserted place the family’s only neighbours are Menseguez, a war veteran; and her young daughter Catalina. The rough winter begins to perturbate day by day. The loud and sharp croak of the frog threatens night by night. When food is scarce, Venancio goes out into a trip to a mournful and desolated place where he finds food and faith to face his fears. When he comes back, while Catalina deals with the abuses of her father, Venancio finds himself face to face with the horned frog.