Janine Gray works for a Hatton Gardens jeweler. One evening, her boss asks her to stay late. Two Germans are coming in, and she's bilingual. It turns out they're a couple of crooks associated with her boyfriend. They kill the jeweler, take a big stone, and knock her out. When she comes to, she's in a fugue state, with her memory gone. She goes into hiding, but the police want to find her. So does her boy friend, and his associates. She wanders around, until she runs into Glyn Houston, a boxer on the downslide who takes a fancy to help rescue the damsel in distress.
It's a bit of idiot plotting, strengthened by Miss Gray's uncertainty of what's going on. The acting is solid, but it all could be quickly cleared up, and the police are on the job, and doing a good one. Still, the acting is good, and the camerawork by Geoffrey Faithfull is solid. Faithfull had been a cinematographer for Hepworth back in the silent era, and would work through the end of the 1960s, totaling almost 200 features and shorts in a long career. He died in 1979, aged 86.