The Sign of Four Sherlock Holmes and Dr. Watson try to track down the Great Mogul, the second-largest diamond in the world. Details Casts Videos Galleries Posters Title The Sign of Four Release Date 1983-12-06 Runtime 01 Hours 37 Minutes Genres Adventure Crime Mystery TV Movie Production Companies Granada Television, Mapleton Films Production Countries United Kingdom Ian Richardson... Sherlock Holmes... David Healy... Dr. John Watson... Thorley Walters... Major John Sholto... Michael O'Hagan... Mordecai Smith... Cherie Lunghi... Mary Morstan... Joe Melia... Jonathan Small... Terence Rigby... Inspector Layton... Clive Merrison... Bartholomew Sholto... Richard Heffer... Thaddeus Sholto... John Benfield... McMurdo... Gordon Rollings... Mr. Sherman... John Pedrick... Tonga... Robert Russell... Williams... Moti Makan... Lal Rao... Kate Binchy... Maid... Merelina Kendall... Mrs. Smith... Sherlock Holmes - Intro to "The Sign of Four" (1983) (Teaser) Original Size (1920x1080) Original Size (1920x1080) Original Size (2400x1349) Original Size (1440x2160) Original Size (1440x2160) Original Size (1000x1500) Original Size (1641x2228) Original Size (500x750) Original Size (1000x1500) Original Size (500x750) Original Size (500x750) Original Size (500x750) Original Size (500x750) Original Size (500x750) Original Size (500x750)