They're trying to stop an abomination, but the solution might be worse than the problem...
After saving half the
other
community from a vampire cabal that wanted to experiment on them, Su and Evgeny really deserve their happily ever after.
Unfortunately, some of the very people they rescued-a group of witches that includes Su's ex-lover-see Evgeny as an abomination for his mix of witch and vampire heritage. They unleash an ancient evil on him, intending to use it as a weapon against him. Instead, the evil gains sentience and becomes a sort of demon, and it has its own motive: to take over Evgeny's body by taking over his mind.
Su will have to convince her ex-lover to help her new lover, but it could mean that Su will lose her own freedom in trying to save Evgeny's, because to be strong enough to face the demon, she'll have to join her power to Alex's.
And the process may be irreversible...