Valley of Fear

At Birlstone Manor, a man is found shot dead, his face destroyed beyond recognition - and Sherlock Holmes suspects the body is not who everyone assumes. Published in 1915, this fourth and final Holmes novel splits into two halves: a tightly wound country-house mystery investigated by Holmes and Watson, followed by an American backstory involving the Pinkerton detective agency and a secret society modeled on the real Molly Maguires. Doyle's most structurally ambitious Holmes story, blending drawing-room deduction with hard-boiled undercover intrigue.