Dragon Guard: Blood Dragon #3 (Vampire Dragon Shifter Romance) - Blood Dragon, #3

The shadow world of the paranormal goes looking for Sarah Rennelle as she finds herself caught up in a cat-and-mouse game with dragons, vampires, and an annoying demigod. Normalcy is invaded by Avery, one of her former students with a penchant for trouble.  This time, however, he's gotten himself in a little too deep and needs her help, or rather, he needs Adam's help.  Blackmail comes into play and Sarah is forced to drag Adam and the others into the mess as they find themselves facing off against two new enemies.
They want Avery, but a series of mistakes leads them to show interest in Sarah.  It's an unhealthy interest in her that leads her away from her companions, and leads Adam into desperation as he tries to find her.  All the while Sarah has a feeling something isn't quite right between Adam and her.  Like so many people around her there's something he's not telling her, and she aims to find out what it is even if it kills her.