In Sir Arthur Conan Doyle's classic detective story "The Adventure of the Speckled Band," Sherlock Holmes uses his powers of observation to solve a crime and prove himself a memorable detective. Upon meeting Helen Stoner, Holmes notices she arrived by train without being told. He deduces this by observing a train ticket in her glove. Holmes' ability to observe and analyze clues makes him unforgettable to readers and allows him to solve crimes in a way that outweighs other detectives. Conan Doyle's detective has remained popular for over a century due to his superior observational and deductive abilities.