Paris has been liberated, but it is not the city blind veteran Frederick Rowlands remembers from the Great War. Summoned by MI5 agent Iris Barnes, Rowlands is drawn into a hunt for traitors and a key witness is a young woman calling herself Clara Metzner, newly released from Ravensbrück concentration camp.

Rowlands once met Clara in Berlin twelve years earlier- but the horrors she has endured have changed her beyond recognition, and he must confirm who she really is. But then the investigation is derailed by a shocking death, possibly murder, and Rowlands plunges into the dangerous world of Parisian high society, where secrets linger, loyalties blur and a killer waits in the shadows.