Purity of blood

A desperate father hires Alatriste to rescue his daughter from a convent where a powerful priest is said to be using the girl as his personal concubine. The father has been prevented from legal recourse because the priest has threatened to reveal that the man's family is "not of pure blood"--Is, in fact, of Jewish descent - which will all but destroy the family name. Alatriste agrees to help, and several nights later, under the cloak of darkness, a rescue attempt is made. But soon Alatriste discovers that he has become part of a religious and political conspiracy that leads all the way to the highest levels of the Inquisition. When a date is set to burn the man's daughter at the stake, Captain Alatriste springs into action.