Months later, Watson and Holmes sit together and recollect the case in the Baker Street apartment. Holmes recalls that most everything they had deduced during the case turned out to be true, and in the interim they have learned whatever details were missing: for example, that Stapleton was the bearded man who shadowed Sir Henry in London. Content with their success, and the hard work they’ve put into other cases in the months that followed, Holmes suggests that he and Watson take the evening off to attend the opera.
The Hound of the Baskervilles was printed chapter-by-chapter in The Strand Magazine before it was sold as a complete, bound book. This fifteenth installment, which is almost entirely redundant, would have helped readers who had read the book over the course of several months remember key details of the case and better understand how Holmes arrived at his conclusions.