The sports plane crashed. Both the pilot and the passenger, a wealthy African Abu-Ruh Yassus, were killed. But why did the Vatican become interested in the accident? Why is the best Vatican paleographer Ottavia Salina involved in the investigation of the disaster - and even the most reliable of the Vatican’s secret agents and a famous historian from Alexandria are assigned to help her? Perhaps it’s because of the mysterious signs found on the body of the deceased? Or Is it all because of an old silver box with mysterious pieces of wood found in his belongings? Ottavia and her assistants begin an investigation and gradually realize that perhaps they have to solve one of the greatest mysteries of Christianity!..