A standalone "Christmas special" that transports the cast back to the 1890s Victorian London setting of the original books. It serves as a psychological bridge between seasons, taking place largely within Sherlock’s "mind palace" as he struggles to solve the mystery of Moriarty’s fate.
The BBC’s modern adaptation of Sherlock (2010–2017) redefined the legendary detective for the 21st century across four high-impact seasons and a special episode. Starring Benedict Cumberbatch as Sherlock Holmes and Martin Freeman as Dr. John Watson, the series consists of 13 feature-length episodes (approx. 90 minutes each) that blend classic Arthur Conan Doyle mysteries with contemporary technology and sharp psychological depth. sherlock holmes seasons