Synopsis

Once a dazzling nightclub singer, she now operates as a spy, having absconded with the United States Navy’s blueprints for a revolutionary submarine. An FBI agent named Burt has traveled to London to apprehend her. Burt holds little regard for the celebrated detective, Poirot, and the Belgian’s keen mind is equally unimpressed by the G-man's bluster. However, Poirot finds himself drawn into the affair when it becomes clear that the submarine plans, if not recovered, will likely fall into the han