彼得·格兰特成为五十年来第一个英国巫师学徒，他必须立即处理两个不同但最终相互关联的案件。在一种情况下，他必须找到是什么控制了普通人，把他们变成了恶毒的杀手;在另一种情况下，他必须在泰晤士河的两个交战之神之间斡旋，实现和平。
Peter Grant, having become the first English apprentice wizard in fifty years, must immediately deal with two different but ultimately inter-related cases. In one he must find what is possessing ordinary people and turning them into vicious killers, and in the second he must broker a peace between the two warring gods of the River Thames.
