Set during the Berlin Blockade of 1948, which has sometimes been described as the Cuban Missile Crisis of the 1940s, where a highly volatile situation could easily have developed into a full-blown conflict. Cormack arrives in Berlin to take over a new post as the head of a counter-intelligence unit whose job is both to detect Soviet agents and to deal with Black Market activity. He is soon re-united with his old friend Woodward, who is involved in the Airlift, and the two find themselves in the middle of an undercover operation in which an ex-Nazi assassin has been smuggled into Berlin. But who has he been sent to kill, and why?