The Sign of Four
Starring Jeremy Brett, Edward Hardwicke, Jenny Seagrove, Ronald Lacey, John Thaw, Emrys James, Alf Joint, Kiran Shah, Terence Skelton, Rosalie Williams
Watch "The Sign of Four" from streaming services britbox-britbox-subscription, TV2 Play (Britbox) released in 1987. It's a crime and action & adventure movie, and has a rating of 7.9 out of 10 from Imdb which is usually fine for this kind of movie.