Christopher Quarles — Percy James Brebner

Professor Quarles is the most lovable, the most learned, the most unpoliceman-like detective we have yet met. As a matter of fact he is not a detective at all, but a scholar, specialising in philosophy and keenly interested in the human motives behind every act. Criminal cases interest him only when it is necessary to find this motive. He confesses that he does not make his theory from facts