Twenty tales of dark deeds, from members of the Mystery Writers of America, offer a menu that almost courses from soup to nuts. From cavemen and cannibalism to gourmet's delicacy, from restaurants to hearthside homicide, each story has a "shirttail" in which the author explains the strength and weakness of his piece. From David Alexander to Lawrence Treat, this is a collation, crime-fashioned for the connoisseur.