An American veteran returns to England after WWII to learn that his London lover has become involved with a dangerous spy ring and their search for a limping sniper.
In need of cash, Roger Cavendish and his valet take a job escorting the perfect woman for a night on the town. She is in fact the robotic creation of Professor Belman, but it turns out rather to be the Professor's niece Penelope doing a pretty good imitation of the perfect Olga who winds up with them in the bridal suite at the Hotel Splendide.
The favourite for the big race is nobbled and suspicion falls on the owner. His secret admirer proves it wasn't him.
