Who is the true Pope? A mysterious brotherhood and the power in the Vatican. The German historian Marlene Schönberg receives a mysterious call. A man claims to have information about a relic that could shake the Vatican. When Marlene tries to visit the man, she finds herself in front of a prison in Marseille. Robert Garnier is suspected of having killed his father in front of the Papal Palace in Avignon. Together with his lawyer, Marlene begins to investigate: it concerns a coin - the Peter's coin, which reveals the true Pope. A first failed attack on her indicates to Marlene that she is on the right track. A thriller by one of the most successful authors of recent years.