La Vallée de la peur
Moriarty plays a direct role in only one other Holmes story, "The Valley of Fear" (1914), set before "The Final Problem" but written afterwards. In "The Valley of Fear", Holmes attempts to prevent Moriarty's agents from committing a murder. In a scene in which Moriarty is being interviewed by a policeman, a painting by Jean-Baptiste Greuze is described as hanging on the wall; learning this, Holmes mentions the value of another painting by the same artist to show such works could not have been purchased on a professor's salary. The work referred to is ; some commentators have described this as a pun by Doyle on a famous Thomas Gainsborough painting, the "Portrait of Georgiana, Duchess of Devonshire", being taken from the Thomas Agnew and Sons art gallery. The gallery believed that Adam Worth was responsible, but was unable to prove the claim.