Sherlock Holmes is a 2009 mystery period action film based on the character of the same name created by Sir Arthur Conan Doyle. Robert Downey Jr. portrays the famous detective Sherlock Holmes, known for his brilliant deductive reasoning and unconventional methods. The film follows Holmes and his loyal friend Dr. John Watson as they investigate a series of mysterious murders. Downey Jr.'s charismatic performance and the film's stylish visuals make it an entertaining and thrilling watch.