Not far from the house of a wealthy Jewish merchant, the body of a brutally murdered boy was caught from the river. Soon three more children disappear without a trace. Residents of the county are accused of killing Cambridge Jews - and they are threatened with cruel reprisals. King Henry II, trying to prevent a bloody massacre, sends a very unusual team to investigate these mysterious crimes - the famous interrogator Simon of Naples, the mysterious Arab Mansur and the young woman Adelia Aguilar, who has mastered the the art of healing. They are ordered to immediately find the real killer! But while all their theories crumble into dust, and the criminal is waiting to strike again...