It is 1813 in Northern Spain. The crew of a British warship is attempting to make contact with the local resistance fighters who are battling the French. They send a brave crewman, known as Cuba Tom, to try to make contact with the local chief of the Guerrillos, but he fails to return. So a young naval officer, Edgar Byrne, sets off to try to trace him. The trail leads him to a strange inn which is run by two very sinister old women...