Former SOE operative Luba Haas and MI6 agent Natalie Jenkins secretly enter Poland to meet with a sleeper agent and anti-communist insurgents not realizing their mission has been compromised by a mole deep inside British intelligence. Hunted by both Soviet and Polish intelligence services, they attempt a harrowing escape, not knowing whom they can trust as they try to outrun their pursuers.

Inspired by the true events of Poland's anti-communist insurgency, the Cambridge Five spy scandal, and a covert MI6 operation which attempted to rollback communism to the borders of the USSR, Operation Nightfall: The Web of Spies sheds light on a lesser-known story of the Cold War and immerses readers into the shadowy world of counterintelligence and spy versus spy operations.