In the final months of World War II, a clandestine group known as The Choir smuggles thousands of escapees out of Nazi-occupied Rome via a secret route known as the Rome Escape Line. When an unidentified airman falls from the sky, The Choir is plunged into lethal danger and the survival of the Escape Line itself is threatened. The Choir is riven with internal tensions and infighting. The organization is in danger of falling apart, which would leave thousands of escaped allied soldiers, POWs, Jews, and objectors stranded in a Rome that is ruled with vicious efficiency by the Nazis. Monsignor Hugh O'Flaherty, the architect of the Escape Line and acknowledged leader of The Choir, broods inside the Vatican, seemingly paralyzed by what he sees as the intolerable risks of keeping the Escape Line