Soon after the Spanish Civil War had ended, Arturo, a lieutenant working for Franco's Secret Service, is asked to find out The art of killing dragons, a Renaissance panel which was lost when some masterpieces of the Prado Museum were moved. During the investigation of the shocking development of the story, Arturo will find himself involved in a world of art dealers and settling of scores in the Spanish Post-War; a world dominated by hate and cruelty; therefore, he will have to face an impossible and destructive love as well as the secrets hidden in the panel, some keys that will take him beyond reason and history.