In medieval Cambridge, England, four children have been murdered. The crimes are immediately blamed on the town's Jewish community, taken as evidence that Jews sacrifice Christian children in blasphemous ceremonies. To save them from the rioting mob, the king places the Cambridge Jews under his protection and hides them in a castle fortress. King Henry I is no friend of the Jews-or anyone, really-but he is invested in their fate. Without the taxes received from Jewish merchants, his treasuries would go bankrupt. Hoping scientific investigation will exonerate the Jews, Henry calls on his cousin the King of Sicily-whose subjects include the best medical experts in Europe-and asks for his finest "master of the art of death," an early version of the medical examiner.