There have been many adaptations of The Sign of Four as one of Doyle's most highly respected works. No adaptation follows implicitly, but this film does well at blending notable passages and dialogue from the book in with adventurous romps through London, and even to a carnival where death seems the main feature. Unlike other adaptations, rather than attempting to solve the case ourselves, we watch the villain at work and follow along as Holmes attempts to piece together the sparse clues.
Although the film takes great liberties in making the storyline unique and exciting, it still manages to convey the very heart of what Doyle intended. Richardson is an excellent Holmes; he portrays him with just the right amount of light humor and intelligence to make him enthralling even while in the background. He also does an excellent job of reacting. When Mary clings to him after a particularly jarring series of events, the uncomfortable Holmes untangles himself and insists on not making a fuss. One scene I happen to particularly like is when Inspector Layton is brought in to the crime scene. Watching him brush off Holmes' suggestions, while our favorite sleuth is attempting not to laugh or groan at his absurdities, is nothing less than humorous. I also appreciated finally witnessing the scene left out in many adaptations... the thrilling chase of the Aurora on the Thames.
Like many others, I find Ian Richardson the definitive Holmes, and mourn that not more films were made with him as the gallant and often eccentric private detective.
