A spate of robberies in jewellery shops in London ends when an officer is shot. Charged with investigating, the case is personal for Marmion as the shot officer is his daughter's fiancee. The evidence points to a gang of Irish Nationalists who seem to be led by a retired actress. However one of the gang is keen to silence the officer permanently so it is a race against time to find them whilst war rages in France.
I hadn't read any of the other books in the series but that didn't seem to matter as I slipped into the characters easily. I really liked the setting in the London police during World War 1, the book is well-researched and evocative. Essentially it is just a police procedural with a twist, but it is a solid one. ( )