In Madrid at the age of 7, Juan Ramon Fuertes witnesses the murder of his parents by two thugs supervised by his father's business partner, Martin Esteban. His identification of the murderers dismissed by the police, the boy vows to avenge his parents. Sustained by his lust for revenge, Juan Ramon endures years of abuse in a Spanish orphanage, where he follows the movements of Esteban in news reports, eventually noticing Esteban's beautiful and pious son, Bernardo. Later, when Bernardo begins training as a monk, Juan Ramon's plan crystallizes: Use the son to get the father. With cool calculation, Juan Ramon begins monastic training, finally entering Bernardo's monastery in Toledo as Father Juan Ramon. Sensing Bernardo's attraction to him, Juan Ramon seduces the young monk to gain access to Esteban. Gradually enthralling the devout, troubled Bernardo, Juan Ramon pursues the two thugs while planning Esteban's murder. But all his schemes for justice hit an unforeseen snag when the fierce avenger falls in love with his tortured protege. Told from the points of view of both Juan Ramon and Bernardo, Blood Brothers explores the fascinating mixture of lust, love, spirituality, and revenge underlying the mutual seduction of a holy monk and his unholy brother.