When a series of threatening anonymous notes drives Bertha Tidy to the police, she is put off with the statement, "These things are worth usually no more than the paper they're written on. You were prompt to put the matter in our hands and we'll see you come to no harm." Twenty-four hours later this proprietress of a hatshop, tearoom and beauty parlor is murdered. Scotland Yard in the person of Detective Inspector Raikes goes determinedly to work on the case, which may be related to five other deaths under suspicious circumstances. Skillfully plotted against an authentic English background, the story draws to a climax not wholly unexpected. It proves that a whodunnit can be a literate and entertaing excursion into murder rather than a hackneyed, pace-ridden dialogue-laden cliche.