Mr. Dawson is the doctor who attends Marian during her illness at Blackwater. At first it seems that Mr. Dawson is a competent doctor, and that Count Fosco is trying to get rid of him because he wants to keep Marian ill so that he and Sir Percival Glyde may more easily carry out their plan against Laura—to switch her identity with Anne Catherick and lock her in an asylum in order to steal her fortune—without Marian’s interference. However, later in the novel, Count Fosco admits that Mr. Dawson was incompetent and gave Marian the wrong medicine, which allowed her fever to transform into deadly typhus, while Count Fosco was genuinely acting in Marian’s best interests to try and save her life because of his love for her.