Prague: Darkness Descending by Robert Tecklenburg

Charles Stanek, former OSS agent, must penetrate the Iron Curtain to rescue his former lover and her child from the clutches of Russian State Security (MGB). In deep cover in Australia since 1946, Stanek returns to Central Europe knowing he must confront his old nemesis, General Andre Pavlov, now running the USSR's counterintelligence from Berlin. They have a history from the war, which included Stanek's escape from the General's torturous grasp. General Pavlov knows that Stanek has arrived in Czechoslovakia and is right under his nose. Using Russian agents and Czech police, he launches a countrywide manhunt to capture and bring him to East Germany, deciding to either turn him or kill him. US intelligence services track Stanek's movements, at the behest of his old boss, General William Donovan. They secretly follow him from the Australian Outback to his arrival in Prague. Stanek eventually learns that they are searching for a Soviet double agent called Attila buried deep in the America