The Three Impostors; or, The Transmutations is an episodic horror novel by Arthur Machen. Contents: Prologue Adventure of the Gold Tiberius The Encounter of the Pavement Novel of the Dark Valley Adventure of the Missing Brother Novel of the Black Seal Incident of the Private Bar The Decorative Imagination Novel of the Iron Maid The Recluse of Bayswater Novel of the White Powder Strange Occurrence in Clerkenwell History of the Young Man with Spectacles Adventure of the Deserted Residence