A woman named Venus is found dead in the Rose Garden of Bern. Shortly thereafter, a man who called himself Saturn is shot by the police. Venus and Saturn – is there astrological magic at play in Bern? The public prosecutor's office recognizes the uniqueness of the cases and requests the assistance of the Müller & Himmel detective agency. They uncover clues that lead back to the 18th century, when Casanova was in Bern. But what does the greatest seducer of humanity have to do with today's crimes?.