A Study in Scarlet by Arthur Conan Doyle

This book, "The Crimson Study," tells the story of how Sherlock Holmes solved the murder of Joseph Stangerson (later Enoch Drebber). The book is published in Victorian England by Dr. Described from the perspective of John Watson.
The book begins when Holmes' partner, Dr. John Watson, settled in London to recover from the wounds and illness he suffered while working as a surgeon during the Second Afghan War.