The Alphabet of Fear (1961)

WWII is entering its last phase: Germany is in ruins, but does not yield. The US army lacks crucial knowledge about the German units operating on the opposite side of the Rhine, and decides to send two German prisoners to gather information. The scheme is risky: the Gestapo retains a terribly efficient network to identify and capture spies and deserters. Moreover, it is not clear that "Tiger", who does not mind any dirty work as long as the price is right, and war-weary "Happy", who might be easily betrayed by his feelings, are dependable agents. After Tiger and another American agent are successfully infiltrated, Happy is parachuted in Bavaria. His duty: find out the whereabouts of a powerful German armored unit moving towards the western front.

Italian partisans help a professor sent by the OSS to find an atomic scientist held by Nazis.

An idealistic young employee at the U.N. investigates the grisly murder of his predecessor – and uncovers a vast global conspiracy that may involve his own boss.

A broker of lucrative payoffs between corrupt corporations and the individuals who threaten them breaks his own rules when a new client seeks his protection to stay alive.

After learning that the death of his wife was not an accident, a former CIA Station Chief is forced back into the espionage underworld, teaming up with an adversary to unravel a conspiracy that challenges everything he thought he knew.

Top special agent Lucinda Kavsky works for a secret part of the CIA. She's given a special assignment but then set up by her own agency.

Spirited New Yorker Linda Voss goes to work for international lawyer and secret Office of Strategic Services operative Ed Leland just before World War II. As they fall in love, the United States enters the fight against Hitler, and Linda volunteers to work for Ed spying undercover behind Nazi lines. Assigned to uncover information about a German bomb, Linda also has personal motives to fulfill: discovering the fate of her Jewish family members in Berlin.

After an unauthorized letter suggesting U.S. support for a Russian attack on China is sent to Moscow, a former naval officer and his team go undercover to retrieve it. Their plans are disrupted when a cunning politician raids their hideout.

At the tense 1938 Munich Conference, former friends who now work for opposing governments become reluctant spies racing to expose a Nazi secret.

Blacklisted in modern day WW2, a Swedish oil trader opts to assist British Allies, by means of infiltrating and surveying Nazi Germany.