Stamboul Quest: In 1915, German Counter-Intelligence Chief Von Sturm learns that someone is providing the British with critical strategic planning for the Turkish theater. He suspects Ali Bey, Turkish commander for the Dardanelles, and dispatches Annemarie to Constantinople to secure the proof. En route, she becomes involved with Douglas Beall, a footloose American. Complications ensue, requiring Annemarie to engage in some dangerous improvisations.