Sherlock Holmes made his creator Arthur Conan Doyle rich and famous, but the writer came to hate his fictional character. Over the course of three programmes, historian Lucy Worsley investigates this curious relationship between Holmes and Doyle, beginning by examining the sleuth's origins in Doyle's time as a medical student. She unpicks the early stories, revealing the dark underbelly of late Victorian Britain, from drug use to true crime, and traces Doyle's growing disenchantment with his detective, heading to Switzerland to visit the site of one of the most famous deaths in literature.