Vampire Trinity: Vampire Queen Series: Club Atlantis

As Anwyn learns to navigate the dangers of the vampire world, it forces her servant, former vampire hunter Gideon Green, into an uneasy alliance with one of the most terrifying vampires he's ever encountered: the mysterious Daegan Rei.

It's clear the three of them must learn to trust each other. But as boundaries between them erode and vulnerabilities surface, Gideon realizes he is no longer the man he thought he was--changed by a strange and unexpected bond with two people he can't survive ...