Christmas, 1940. France is under German control, Britain is in danger and the United States has yet to join the war. Ireland, meanwhile, has succeeded in staying neutral – so far. Reports of a British troop buildup in the North have raised fears that Ireland is facing an invasion by its neighbour. And Germany's bombing of Dublin early in the new year suggests Berlin is trying to send a message, but the meaning is unclear. Paul Duggan and his colleagues in G2, the intelligence unit of the Irish army, have to decipher Germany's intentions fast: any miscalculation could be fatal. One man who could answer their questions is Hermann Goertz, the chief German spy in Ireland, who has been on the run for almost a year. Finding him is imperative. Meanwhile, Duggan is also running an undercover operation spying on German fliers interned in Ireland when they're out on parole. Planned as a routine operation, it turns out to be anything but – and changes Duggan's life...