Alexis. No Oaths for The Dead. Deamhan Chronicles, #5.5

When her sire is slaughtered and his legacy reduced to whispers, Alexis inherits the throne of Minneapolis' vampire underworld-and the enemies that come with it. Cassius, an ancient rival, moves to seize control. The Brotherhood demands the return of Veronica, a dying researcher caught in their web of dark experiments. And her own vampires question if she's strong enough to lead. To survive, Alexis must do the unthinkable: forge a fragile alliance with a man altered by the very magic they both despise.
But as old oaths crumble and war looms, Alexis learns the price of leadership isn't just blood-it's who you're willing to sacrifice to keep it. Because in this city, the dead remember everything. And they don't forgive.