A Visigoth count conquers a small village town from the Moors in the Lusitanian mountains, only to loose his possessions through the mysterious workings of a woman from parts unknown.
Professor Hermes conducts a research on fear, for which he passes contract with a patient to live a supposedly empty mansion. He's counting on his assistant Chico Mota to play a phantom, but soon comes about that there are phantoms (plural) in there.