Aloma lives and works in Barcelona with her uncle Cyrus, an antiquarian and restorer of works of art of all kinds. In his huge shop, he keeps the last remnants of an old galleon, the Thrill Seeker, in which a few gangsters suspect part of the treasure it once transported. This will put the lives of the protagonists in danger again and again throughout the story. Cyrus and Aloma hire Gerald Quer, a private investigator, to find the treasure, if it really exists. Some traces lead Gerald to Panama, where Aloma wants to sell a Vermeer painting to a millionaire. Gerald decides to accompany her and the suspicion grows in him that Aloma is hiding a very dark secret. But on the island of San Jose, where the Thrill Seeker landed four hundred years earlier, a deadly threat awaits...

Dr. Cyrus, the world's leading antique restorer, is at home with his niece Aloma and her boyfriend, Detective Quer, when a lawyer suddenly visits him. This represents a mysterious anonymous client who is in search of the legendary, perhaps mythical "head" of Pope Silvester II. It is a talking mechanical head, constructed by the Pope over a millennium ago with satanic powers, and which should help every owner to power and wealth. Dr. Cyrus accepts the assignment to find this "head," but he learns almost too late that he's not the only one looking for it. Cyrus and his staff are monitored and tracked. Not only is the history of this “head” full of dangers, but also the search for it. It's a race against time and also a race for their lives.