Murder gone mad / Philip MacDonald

A long knife with a brilliant but perverted brain directing it is terrorising Holmdale – innocent people are being done to death under the very eyes of the law. After every murder a business-like letter arrives announcing that another ‘removal has been carried out’, and Inspector Pyke of Scotland Yard has nothing to go on but the evidence of the bodies themselves and the butcher’s own bravado. With clear thinking impossible in the face of such a breathless killing spree, the police make painfully slow progress: but how do you find a maniac who has no rational motive?