Thicker Than Blood — Angela Roquet

Blood Vice Book 5

With her home and heart in ruins, Jenna is none too keen on the idea of helping the Duke of House Lilith -- the man she holds responsible for everything wrong in her life. But when the Vampiric High Council summons Ursula, Duchess of House Lilith and Jenna's unsuspecting grandsire, to a trial where she's to stand accused of murdering her sire and abandoning her depraved scions, the duke is eager to strike a deal. If Jenna helps him protect Ursula, he will keep her darkest secret and put in a good word with the adoptive sire the queen assigns to her. Oh, and return her guns -- provided she doesn't use them on him.