Why does Helen Stoner come to see Holmes?

Helen Stoner comes to see Sherlock Holmes at his 221 B Baker Street residence on the recommendation of Mrs. Farintosh, a woman Holmes had helped with a matter regarding "an opal tiara."

Miss Stoner is plagued by vague fears and suspicions that others, including her fiance, do not take seriously. She feels that she is being dismissed as a nervous woman. Miss Stoner believes that Holmes "can see deeply into the manifold wickedness of the human...

Helen Stoner comes to see Sherlock Holmes at his 221 B Baker Street residence on the recommendation of Mrs. Farintosh, a woman Holmes had helped with a matter regarding "an opal tiara."

Miss Stoner is plagued by vague fears and suspicions that others, including her fiance, do not take seriously. She feels that she is being dismissed as a nervous woman. Miss Stoner believes that Holmes "can see deeply into the manifold wickedness of the human heart" and help her.  Her mother is dead, and her stepfather treats her badly; as a result, she has no one else to confide in or help her. Her twin sister died under mysterious circumstances after commenting on hearing a low whistle in the night.  On the night before Miss Stoner arrives at Holmes's apartment, she heard the whistle as well. Moreover, she does not understand her sister's dying words: "It was the band! The speckled band!" Miss Stoner wants Holmes to find out what caused her sister's death and how the whistle and the speckled band figure in the case.