During a blackout on the streets of London in late 1944, a young Polish land girl, Rosa Nowak, is suddenly and brutally killed. But the police, their resources already stretched by war regulations and the thriving black market, cannot find any reason why someone would want to murder an innocent refugee. For the former police inspector John Madden, the crime hits close to home. Rosa was working on his farm and he feels personally responsible for not protecting her. His old Scotland Yard colleagues Angus Sinclair and Billy Styles struggle to make sense of their few clues. Their only lead points towards Europe – but as the fighting sweeps across the continent, will they find the killer before he strikes again?