A dead Catholic priest turns up, and the police begin to investigate. In parallel, from the Vatican an emissary is sent to investigate this crime. That is how Father Simon Castell and Marie Blank meet.
After an alleged suicide at a Jesuit boarding school, Marie arrives to investigate the case. For his part, Father Castell is informed of this event, and meets Marie, who asks for his support.
A Jesuit priest is found drowned in a river. Marie and Father Castell meet again to find out what happened with this crime. They discover that this priest was after some lost relics from a couple of centuries ago.
A young woman is found dead in a forest. Marie asks Father Castell for help and he indicates that the young woman's burial was under a pagan ritual from a very distant community.
The death of a monk in a monastery alerts Cardinal Scarpia, following a letter sent by this monk and asks Father Castell to investigate. Father Castell suggests Marie Blank go to investigate under the facade of marriage.
Father Castell and Marie Blank are investigating in Malta, each one by separated, two cases, which at one point can be seen, are related. The theft of a relic and the murder of a Vatican advisor bring them together.