This WWII-set mystery series about new British agent Evelyne Redfern is proving to be a real delight. This second entry in the series sees newly trained Evelyne and her partner David investigating suspicious reports from a secret weapons development center outside London. As with the first book, which was set in the Cabinet War Rooms in London, the setting and historical context are very well done. Both are convincing and rich without ever being distracting. The mystery is compelling and has a sense of urgency, and the characters are likeable and engaging. I look forward to the next in the series. Thanks to NetGalley and the publisher for an advance copy. My review is entirely my own freely offered thoughts.