Like 13 Rue Madeleine (1947), the film was intended as a tribute to Office of Strategic Services (OSS) operations in German-occupied Europe during World War II.

By befriending and then blackmailing Ann Dawson, an attractive American now a German agent, he discovers where Katerin is being held, but an OSS raid on the building fails and she is shot dead.

In the ensuing gun battle, Alvah and Gina smuggle Polda out through a tunnel from the house to a nearby well and struggle across country to a rendezvous with a British aircraft which will fly them out.

"[3] Producer Milton Sperling, who had frequently quarreled with Lang on the set, thought the final scene ridiculous, since the audience knew the Germans had no nuclear capacity.

Cloak and Dagger began with actor Raymond Edward Johnson asking "Are you willing to undertake a dangerous mission for the United States knowing in advance you may never return alive?