This description of Mr. Campion in the final story Margery wrote:
In his own apologetic way Mr. Campion was a celebrated figure. In his time he had performed a number of services for a great many causes. He was a negotiator and an unraveler of knots, and there were still people who suspected, because of his wartime activities, that he had a cloak and a dagger somewhere concealed. Those who disliked him complained that he seemed negligible until it was just too late.