When King Henry II's mistress is found poisoned, suspicion falls on his estranged queen, Eleanor of Aquitaine. The king orders Adelia Aguilar, expert in the science of death, to investigate — and hopefully stave off civil war. A reluctant Adelia finds herself once again in the company of Rowley Picot, the new Bishop of St. Albans — and her baby's father. Their discoveries are shocking and ominous signs of greater danger to come.