Spanish horror thriller. A young woman from the city is raped in a remote area by a travelling vacuum cleaner salesman as she waits for her husband, a spelunking specialist, to return from an expedition into a newly discovered cavern. Her husband and his assistant - a local potholer - return and confront a man they believe to be responsible. Shades of 'Deliverance' follow as the case is tackled by the diligent village cop and a series of highly creepy locals come into the picture. The story is told through the eyes of six individuals involved in the story, building the tension and sense of foreboding.