The Case Of Lady Beryl is a Sherlock Holmes television movie from 1954 (top fourth from left image).
It stars Ronald Howard as Holmes, H. Marion Crawford as Dr. Watson and Archie Duncan as Inspector Lestrade.
An Austrian man is murdered and Lady Beryl confesses to the crime.
However, just by hearing that news, Holmes declares that she’s innocent.
He’s right and the murderer turns out to be Lord Beryl’s secretary.
It was all to do with the sale of secret papers.
Movie pages here.