Sherlock Holmes's beloved detective stories all have their origin in notes taken by Holmes's friend and biographer, Dr. John Watson. Now, fans can peek at this precious preliminary material, from letters to newspaper articles. The scrapbook includes Watson's sketches of the paw prints discovered near the body of Sir Charles Baskerville; the address label from the gruesome parcel sent to Susan Cushing in "The Adventure of the Cardboard Box"; and Holmes's...