in the final months of World War II, a clandestine group known as The Choir successfully smuggles thousands of escapees out of Nazi-occupied Rome via a secret route known as the Escape Line. When an unidentified airman falls wounded from the sky, The Choir is plunged into danger and the survival of the Escape Line itself is threatened. The Escape Line's collapse would leave thousands stranded in a city ruled with an iron fist by its German occupiers. Monsignor Hugh O'Flaherty, the Escape Line's architect and the acknowledged leader of The Choir, broods inside the Vatican, paralyzed by the perils of keeping his Roman underground railroad functioning. Meanwhile, SS Commander Paul Hauptmann has been tasked with destroying the entire operation, and the price of failure is high - his wife and children are under Gestapo lock-and-key in Berlin. Into this deliriously thrilling melee steps Contessa Giovanna Landini, a reckless, audacious, and magnetic member of the Italian Resistance who has the nerve to challenge Hauptmann's authority.