The Adventure of the Solitary Cyclist

Sir Arthur Ignatius Conan Doyle was a Scottish writer and physician, most noted for his fictional stories about the detective Sherlock Holmes, which are generally considered milestones in the field of crime fiction.
"The Adventure of the Solitary Cyclist", one of the 56 Sherlock Holmes short stories.
Sherlock Holmes first regards the experiences related by newly-arrived visitor Violet Smith with a degree of impatience and disinterest. This solitary cyclist, however, is being shadowed by a mysterious man on a bicycle as she travels to and from her new employer's home as a music teacher. As Holmes and Watson investigate, a dark, dangerous picture begins to emerge that threatens the young lady's safety and ultimately her freedom.