The Beryl Coronet (S1E8): Mr. Holder, a city banker, is Holmes' latest client. A prominent customer left him a beryl-encrusted coronet as a surety against a loan. Mr. Holder took the coronet home for safekeeping and was shocked to find his son Arthur attempting to deface it. Holmes deduces that Arthur is innocent and was only trying to cover up for another family member who has been duped by a smooth-talking thief. It features Douglas Wilmer, Nigel Stock, Leonard Sachs, and Suzan Farmer. Sherlock Holmes is a British BBC television crime drama mystery series, which originally aired from 1964 to 1968.