The fictional detective known for his keen observation skills is Sherlock Holmes. Created by Sir Arthur Conan Doyle, Holmes is renowned for his exceptional deductive reasoning and ability to solve complex cases that baffle others. His character first appeared in "A Study in Scarlet" in 1887 and has since become an enduring literary icon. Holmes often relies on forensic science and acute attention to detail, enabling him to perceive clues that others overlook. Accompanied by his faithful friend Dr. John Watson, Holmes tackles various mysteries in Victorian London, ultimately influencing the detective genre and inspiring numerous adaptations in film, television, and literature.