TILTING at heavyweights is somewhat like tilting at windmills. Both require a certaindegree of foolhardiness. And to tilt at a heavyweight with the credentials of HenryRaymond Fitzwalter Keating—twice the recipient of the Golden Dagger Award, recipientof the Edgar Award, recipient of the Diamond Dagger Award, the President of the DetectionClub, critic, biographer, author of over 50 books—you get the picture, right?