Next, The Sign of Four presents Holmes’s famous “seven percent solution” and the strange puzzle of Mary Morstan in the quintessential locked-room mystery. Also included are Holmes’s feats of extraordinary detection in such famous cases as the chilling “The Adventure of the Speckled Band,” the baffling riddle of “The Musgrave Ritual,” and the ingeniously plotted “The Five Orange Pips,” tales that bring to life a Victorian England of horse-drawn cabs, fogs, and the famous lodgings at 221B Baker Street, where Sherlock Holmes earned his undisputed reputation as the greatest fictional detective of all time.