In the midst of World War II, skilled Air Force pilot Louella Sterling is recruited as a spy for the Allies. As she takes on the codename "The Cipher," she must navigate dangerous covert missions deep within Nazi-occupied Europe.
Meanwhile, her husband Bennett, head of US intelligence, must direct operations from afar. Their marriage is tested as the strain of war and separation threatens to tear them apart.
But as Louella gathers vital intelligence from high-profile enemy circles, the risk of exposure grows with each mission. Will their love survive the crushing demands of war?