The famous Spanish violinist Ane Larrazabal is strangled in the National Concert Hall of Madrid, where she had just played Paganini's Caprice No. 24, one of the most difficult violin works for a performer. Larrazabal's priceless Stradivarius violin with a devil's head scroll disappeared without a trace. The investigation is entrusted to one of the best inspectors of the judicial police, Raul Perdomo. He is not inclined to believe in paranormal phenomena, but, unable to explain his own strange visions, he resorts to the help of the psychic Milagros Ordonez. Her participation will play a key role in revealing the identity of the killer...