To escape a life of poverty, the mercenary Sir Benedict Palmer takes on one last lucrative job: he is to assist King Henry II's knights in capturing the traitor Archbishop Thomas Becket in Canterbury Cathedral. However, what begins as a covert arrest ends in cold-blooded murder. When Fitzurse, the leader of the knights, kidnaps Theodosia, a beautiful young nun and witness to the crime, Palmer can no longer stand by silently. For not only is Theodosia's virtue at stake, but also the secret she unknowingly harbors—a secret that Fitzurse will stop at nothing to seize. Now, Palmer and Theodosia find themselves on the run, strangers from different worlds who must rely on each other as they work together to uncover the hidden motive behind Becket's gruesome murder.