Silesian Station by David Downing.

The continuing adventures of a British/American reporter trying to survive in Nazi Germany in 1939. As war approaches out hero has swapped his British passport for a US one in order to remain with his German son and girlfriend a little longer. Again he is forced to play one side off against the other in order to survive but he can no longer ignore Nazi evil and takes increasing risks to work against them. I am really enjoying this series.While the hero John Russell's spy story escapades are as implausible as they are entertaining  Downing's portrayal of Nazi Germany is utterly believable and utterly horrifying.

Zoo Station by David Downing

John Russell is a reluctant spy but as an English reporter living in Nazi Germany in 1939 he finds that the British, the Russians and the Germans all want his services. Can he maintain his personal integrity as he is forced to trade one side against another just to survive? Brilliant spy story set against the back drop of a country that is descending into evil madness.