John Cheney - City of Spies

Four years before the fall of the Berlin Wall, East Germany was preparing for war. A series of exercises were conducted simulating an invasion of West Berlin. But what if one of these operations was no exercise?
In 1985, Border Troop officer Hans Brandt rises to the inner circle of the East German government, where leaders have begun to fear the country’s inevitable collapse. Hans discovers Stasi colonel Karl Scharf’s audacious plan to save the GDR—actually conquer West Berlin. Wanting to prevent a war, Hans moves to stop the invasion. But when Scharf uses a mole hunt to leverage his plan, Hans is drawn into a battle of espionage that will cost him more than he can know.
Using actual secret East German invasion plans and real locations, City of Spies is a historical thriller that brings modern insight into a pivotal world era. Seen through the eyes of Hans Brandt, the struggle to peacefully end the Cold War presents a precarious balance of power, escalating tension between rival factions, and ultimately a race for personal survival. Like many world events that hinge on a few actions, City of Spies shows the peaceful revolution in Eastern Europe was anything but inevitable. Twenty-five years after the fall of the Berlin Wall, City of Spies finds startling relevance.