I found this as an audio on Scribd not realizing it was the 4th of a series but I had no problems following the characters. It is 1947 and there have been a series of execution type murders. Former Scotland Yard Inspector John Madden‘s name came up in an unsent letter from one of the victims and he is consulted. Loved the characters, the plot was good and the narration was excellent- it is post war Britain coming to terms- I will now read #1! 4⭐️