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 an episode in which Moriarty is being interviewed by a policeman, a painting by Jean-Baptiste Greuze is described as hanging on the wall; Holmes remarks on another work by the same painter to show it could not have been purchased on a professor's salary. The work referred to is "La jeune fille à l'agneau"; some commentators have described this as a pun by Doyle on the Thomas Agnew and Sons art gallery which had a famous Thomas Gainsborough painting, the "Portrait of Georgiana, Duchess of Devonshire" stolen by Adam Worth but were unable to prove the claim.