The King's Vampire: Kindle ebook by Brenda Stinnett

Elizabeth Curran longs to break the bonds of vampirism, but psychic
vampire demons plot to use her to entrap Charles Stuart II into
becoming an immortal vampire. Darius Einhard, demon slayer, will stop
at nothing to prevent this from happening, but he must enlist
Elizabeth's help to save Charles. The age-old conflict of good against
evil begins.

The psychic vampire demons, who drain humans of all hope and feed off
negative energy, desire to open the abyss of hell and control humans
for all eternity. Darius and Elizabeth enlist the help of immortal
vampires, who have no quarrel with humans, as well as shape-shifters,
to battle these vampire demons.

This is a battle of the mind as well as the body. The immortal
vampires must exist in a soulless limbo and survive their own
immortality. The possibility of salvation and redemption is there for
those who dare unleash the power of the universe in order to close the
abyss. Is the vampire 'bloodlust' a code word for the demons that
dwell within us all? It is a journey that Elizabeth and Darius must
take together to find out if their love is strong enough to overcome
their demons.