Sign of the Four or The Problem of the Sholtos, Paperback/Arthur Conan Doyle

First published in 1880, The Sign of the Four - the second Sherlock Holmes novel after A Study in Scarlet, published three years earlier - will sweep the readers away into a story of murders, betrayals, double-crossings and stolen treasures, and is an enduring testament to the storytelling genius of Arthur Conan Doyle.