Rosemary Horrox surveys contemporary attempts to explain the plague, which was universally regarded as an expression of divine vengeance for the sins of humankind. Moralists all had their particular targets for criticism. However, this emphasis on divine chastisement did not preclude attempts to explain the plague in medical or scientific terms. Also, there was a widespread belief that human agencies had been involved, and such scapegoats as foreigners, the poor and Jews were all accused of poisoning wells. The final section of the book charts the social and psychological impact of the plague, and its effect on the late-medieval economy.