Part of the Mark of the Vampire series, this instalment is best suited to those who already follow the books. Hellen is a demon girl who is promised in marriage to Cruen, a vampire she has not met. A mutant vampire, Erion, kidnaps her to try to gain revenge on Cruen for previous events. Only a small number of vampires are capable of breeding and if power-hungry Cruen produces a child with a demoness that child should have special abilities.

ETERNAL DEMON focuses on Erion, a wronged vampire man who can travel in swift flashes, control dogs and to Hellen's bewilderment, can see portals to the Underworld that only demons know exist. The demoness has her own abilities but Erion still manages to chain her up in a cellar under his house. The restraints came with the house, we're told. Both Erion and Cruen view the female as a bargaining chip; they don't credit her with having her own identity.

Laura Wright is clearly absorbed in the worlds of her creation and this makes it difficult to read ETERNAL DEMON as a standalone - many references, characters, varieties of preternatural creatures and locations. On the other hand, if you enjoy this adult semi-horror story it could well make you keen to search out the earlier books in the series. I am sure her fans will appreciate this instalment and look for more.