Released in the U.S. as The Girl Was Young, this Hitchcock film was based on the novel A Shilling for Candles by Josephine Tey. In the book, the storyline involving Robert, Erica, and the missing coat is a subplot, not the main tale.
Christine Clay (Pamela Carne), a successful actress, and her ex-husband, Guy (George Curzon), are arguing over whether their quick Reno divorce is final. What is final is her washing up dead on a beach and the cops blaming the man who found her body, writer Robert Tisdall (Derrick De Marney). He’s defended by a cop’s daughter, Erica Burgoyne (Nova Pilbeam), and sneaks out of the courtroom and rides on the running board of her car to escape the law.
One of Robert’s old coats is behind the killing; the belt was used. He can’t find that coat until he sees it on a homeless man. The belt is missing, however, and the man tells Robert and Erica that a man with twitchy eyes — just like the one we saw Guy have at the beginning — gave him the overcoat.
Despite how long ago this came out, the end is still great, as a crane shot reveals that Guy is a drummer in a band — in blackface — and he starts twitching so much when the cops arrive that he has to take medicine that knocks him out. Hitchcock said that it took two days to shoot the long tracking shot in the dance hall, as the camera pans from the ceiling to the band to Guy’s eyes.
You can download this from the Internet Archive.