3.75 stars

This is the fifth in an intriguing series that began after WWI and continues into the 1940's. Former Scotland Yard Inspector John Madden, long retired, gets drawn into the re-investigation of an old murder case. An anonymous letter questions the guilt of the man who hanged for the crime.

Madden helps track down witnesses from 10 years earlier, including a mysterious part Chinese man who was a key figure when the murder occurred.

This is a nicely done police procedural with a strongly drawn ensemble cast. The plot hangs together pretty well, and John Madden is an appealing protagonist.

I was provided a free ARC via Net Galley in return for my honest review