The tide of the Second World War is turning. The Russian victory at Stalingrad - the bloodiest battle in history - has opened the door for the Allies. Now, they must strike decisively at the heart of Hitler’s Reich. But military success cannot be guaranteed without total secrecy.
Special Operations Executive’s Saffron Courtney is sailing from the west coast of Scotland to New York on the Queen Mary. Her mission - to identify the mole in the British Embassy in Washington, DC before Churchill and Roosevelt begin the talks that will determine British and American military strategy in the wake of the Russian victory.

Haunted by the ghosts of her previous mission in the Low Countries, and with dangerous agents on her tail, Saffron must find the spy who could derail the Allied advance. Time is running out. Will Saffron complete her mission? Or will she succumb to the shadows of her past?