In Chapter 14 of “The Hound of the Baskervilles,” Holmes and Watson are returning to Baskerville Hall after their trip to Dartmoor. Holmes receives a telegram from Sir Henry, who is still in London, asking for his help. Upon arrival, they find that Sir Henry has received a letter from an unknown person, which warns him to stay away from the moor or face dire consequences.

Holmes examines the letter and concludes that it was written by Barrymore, the butler of Baskerville Hall, and that he is hiding something. They confront Barrymore and his wife, who confesses that they have been secretly helping Selden, the escaped convict, by giving him food and shelter. They had also written the warning letter to Sir Henry in the hope of scaring him away from the moor and protecting him from danger.

Holmes and Watson track down Selden to an abandoned tin mine on the moor. Selden reveals that he is not the killer, but had stumbled upon the real culprit, who is none other than Stapleton. Stapleton had been using the legend of the hound to scare Sir Charles to death and inherit his estate. When Sir Henry arrived, he became the new target.

As they are about to leave the mine, they hear the sound of a hound and realize that Stapleton has set the hound on them. They run for their lives and manage to escape the hound, but Stapleton falls to his death in the Grimpen Mire, a treacherous bog on the moor.

The chapter ends with Holmes and Watson pondering over the case and the mystery of the hound. They conclude that the hound was nothing more than a cleverly trained dog, which Stapleton had used to perpetrate his crimes.

In summary, Chapter 14 reveals the true identity of the culprit behind the Baskerville curse and the legend of the hound. It also shows how Holmes and Watson work together to unravel the mystery and bring the culprit to justice. The chapter ends on a note of satisfaction and closure, as the case is finally solved.