Professor and amateur detective Henry Spearman trails a killer in the UK, using economics to try to solve the case Harvard professor Henry Spearman—an ingenious amateur sleuth who uses economics to size up every situation—is sent by an American entrepreneur to Cambridge, England. Spearman’s mission is to scout out the purchase of the most famous house in economic science: Balliol Croft, the former home of Professor Alfred Marshall, John Maynard Keynes’s teacher and the font of modern economic theory. After a shocking murder, Spearman realizes that his own life is in danger as he finds himself face-to-face with the most diabolical killer in his career.