1942: a German spy comes ashore on a desolate stretch of Lincolnshire beach. But he is hunted down by a young detective, Richard Prince. The secret services have need of a man like him.... In occupied Europe, Denmark is a hotbed of problems for British intelligence. Rumours of a war-ending weapon being developed by the Germans are rife. Sent to Copenhagen, Prince is soon caught in a deadly game of cat and mouse. Dodging Gestapo agents, SS muscle and the danger of betrayal, his survival - and the war effort - hangs in the balance. 

The Allies are desperate to stop neutral Turkey supplying vital materials to the Nazis - materials which could help them win the war. But then a British agent makes a fatal mistake and disappears in Istanbul. In England, detective-turned-spy Richard Prince - back from a clandestine mission in Nazi-occupied Europe - is hunting for his lost son. Before long he is drawn into a dangerous follow-up operation, posing as a journalist in Turkey. The mission soon goes wrong.

As the war approaches its end, Prince once more has to risk everything. Berlin, 1939: a German intelligence officer learns a top agent is quickly moving up the British Army ranks. He bides his time. Arnhem, 1944: British paratroopers have been slaughtered in one of the bloodiest battles of the Second World War. A shell shocked officer is convinced that the Germans knew they were coming. But who betrayed them? Back in London, Richard Prince, detective and spy, is approached by MI5 about a counterintelligence operation.