"A Study in Scarlet is an 1887 detective novel written by Arthur Conan Doyle.

The story marks the first appearance of Sherlock Holmes and Dr. Watson, who would become the most famous detective duo in popular fiction.

Sir Arthur Conan Doyle's A Study in Scarlet is the literary debut of the world's most famous fictional detective, Sherlock Holmes, introduced by Iain Sinclair with notes by Ed Glinert in Penguin Classics.

On the wall, the word rache - German for 'revenge' - is written in blood, yet there are no wounds on the victim or signs of a struggle.

Watson's head is in a whirl, but the formidable Holmes relishes this challenge to his deductive powers, and so begins their famous investigative partnership."