
You return from the Afghan campaign thin, wounded, and low on money for a London hotel. Stamford, an old friend, takes you to a hospital laboratory to meet a man who has just perfected a test for old bloodstains and needs someone to split the rent on rooms in Baker Street. Sherlock Holmes reads your history from your bearing before you can offer it, and within a day of moving in, a telegram arrives: a dead American in Brixton, no wound, one word written in blood.
Read A Study in Scarlet