1966. Twelfth Impression. 571 pages. No dust jacket. Red cloth. Comnprises A Study In Scarlet, The Sign Of Four, The Hound Of The Baskervilles, The Valley Of Fear. Pages remain bright and clear with minimal tanning and foxing. Front hinge cracked with exposed netting. Binding remains firm. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces.