Disguised Maid Saw Through by the Vampire Lord

Lia is a maid in the castle of the vampire lord Adrian, and she is there for revenge. Her family were a clan of hunters, and they were massacred. She is the last of them. Adrian has already worked out who she is. He proposes an alliance anyway, because the two of them have the same enemy in Victor. Lia keeps up the maid's work and gathers evidence around the castle in secret. What she finds proves Victor's treachery. At a bloodline banquet, in front of the whole vampire court, she brings it out and Victor is disgraced. His collapse begins to uncover a larger conspiracy, one in which he was only a pawn.