A genealogist and a cop: a great team for uncovering the origins of the crime.
When a priest is found dead in his confessional holding part of an old parchment covered with Masonic symbols, police ask Margot to help decode the text, thinking it's a clue to the motive for the crime. As the investigation proceeds the church's cleaner provides more clues, as does a talking parrot, and a few dead ones.