In the story, the brilliant detective Sherlock Holmes is consulted by a beautiful young music teacher named Violet Smith. For the past few months, Miss Smith has been teaching the young daughter of Mr. Carruthers, a friend of her late estranged uncle, at his house in the country. Not only is she getting paid twice the usual rate, but she is also allowed to go home to her mother in London every weekend. Lately, however, she has been bothered by a mysterious cyclist who follows her as she rides her bicycle to and from the train station. Already engaged on another case, Holmes enlists the help of his friend Dr. Watson with the investigation. But the seemingly trivial case soon takes a curious turn, and Holmes decides to personally look into the mystery.