Mild mannered Catholic priest Fr. Brown solves another mysterious mystery. How did the dead man get into the garden of Aristide Valentin, Chief of the Paris Police. There was no way in and no way out other than past a well guarded door. Also you may ask how did he end up dead, and who killed him. There are plenty of suspects, but Fr. Brown sorts it all out without relying on the confessional, therefore remaining true to his vows.