It is difficult to know quite where to begin this story, but I have fixed my choice on a certain Wednesday at luncheon at the Vicarage. The conversation, though in the main irrelevant to the matter in hand, yet contained one or two suggestive incidents which influenced later developments.

I had just finished carving some boiled beef (remarkably tough by the way) and on resuming my seat I remarked, in a spirit most unbecoming to my cloth, that any one who murdered Colonel Protheroe would be doing the world at large a service…