The original super-sleuth, Sherlock Holmes, is back on the case. When James Wilson retires from journalism, he decides to settle down in Herefordshire with a roommate, a Mr. Cedric Coombes, and at first thinks little of his new friend's eccentric behaviour. But he can't shake the feeling that he knows him from somewhere else. As Coombes displays his magnificent deductive prowess, and becomes embroiled in the police investigation of the apparent murder of a man in bathtub, Wilson, or should we say Watson, begins to wonder just who this Coombes really is.