The Case Of The Winthrop Legend is a Sherlock Holmes television movie from 1954.
It stars Ronald Howard as Holmes, H. Marion Crawford as Dr. Watson and Archie Duncan as Inspector Lestrade.
The Winthrop legend states that any family member who finds silver coins in their possession is going to die.
Holmes and Watson visit Winthrop Manor where there are deaths and they solve the mystery.
Movie pages here.