The Mysterious Case of the Speckled Band

The episode centers around the chilling case known as 'The Adventure of the Speckled Band,' as narrated by Hugh Bonneville. It follows the investigation of Sherlock Holmes and Dr. Watson after a young woman, Helen Stoner, seeks their help regarding the mysterious death of her twin sister, Julia. Julia's death occurred just days before her wedding, under alarming circumstances that Helen believes were linked to their violent stepfather, Dr. Grimsby Roylott. As Helen recounts the details of her sister's last moments, including a mysterious whistle heard on the night of her death, the tension builds around the dark secrets held within the Roylott family manor.