Antonia guards the devil. Caelia is his daughter.Mayor Crassus is the most corrupt man in Black Port. He's never met a con he didn't like, or grift he rejected. He's mercenary, cold-blooded, and ruthless in turns.In order to better feather his own nest, he's promised his daughter's hand to one of the king's most ruthless inquisitors. Caelia, in whose veins flows the blood of a powerful matriarchal line of witches, knows it would be a fate worse than a death sentence.Whatever it takes, she must escape.She turns to Knight Protector Antonia Brocklehurst, her father's bodyguard - a woman with plenty of secrets of her own.But Antonia's mission could save the lives of hundreds. Can she abandon it to save one woman - even if she has loved her for years?