'Monsieur Judas: A Paradox' is a novel written by Fergus Hume, a British author known for his mystery and detective fiction. Fergus Hume is particularly famous for his novel 'The Mystery of a Hansom Cab,' which was one of the earliest detective novels and achieved great success.Specific details about the plot and characters of 'Monsieur Judas: A Paradox' would require access to the text or additional information. It is likely that this novel contains elements of mystery or intrigue, which were common themes in Hume’s works.