Isla Bevan, a prominent figure in early 20th-century cinema, carved her niche in the film industry with her captivating performances, particularly in the 1932 classic, *The Sign of Four: Sherlock Holmes' Greatest Case*. This film, a unique adaptation of Arthur Conan Doyle's iconic story, remains a sought-after piece among collectors for its historical significance and Bevan's remarkable portrayal of Mary Morstan, a character that resonated with audiences of the time. Collectors are drawn to Bevan's work not only for her talent but also for the rarity of physical media from this era. *The Sign of Four* showcases the transition from silent films to talkies, making it an essential addition to any serious collection. The film's unique blend of mystery and early cinematic techniques offers a glimpse into the evolution of storytelling in cinema, solidifying Bevan's legacy and ensuring her films remain cherished artifacts in the world of physical media.