Show the character sketch of Helen in The Speckled Band?

In Arthur Conan Doyle's "The Speckled Band," Helen Stoner is portrayed as a frightened yet determined young woman. She is intelligent and resourceful, seeking the help of Sherlock Holmes after the mysterious death of her sister, Julia. Despite her fear of her stepfather, Dr. Grimesby Roylott, she displays bravery in confronting her circumstances. Helen's vulnerability is contrasted with her resolve to uncover the truth, making her a compelling and sympathetic character.