Metropolis by Philip Kerr is the prequel to the outstanding Bernie Gunther series. The harried, Berlin detective is trying to survive in 1928 Berlin. It’s the beginning of his career in the Murder Consortium. It’s Bernie’s origin story and a close up of the chaotic environment in Berlin at that time. A killer is on the loose and despite numerous clues, the hunt is frustratingly fruitless. This series is rightfully well known for excellent character development and a strong sense of place. This is a good way to get in at the beginning and get hooked.