The story of Wraith and Serena is a mixture of a paranormal romance (Wraith is a vampire-Seminus demon) and an Indiana Jones archeological adventure (Serena is an archeologist-top adventurer-treasure hunter). 
 Wraith is the second brother of Eidolon. His upbringing was really tough. Thus, he has become emotional unstable, scarred inside, untrusting, badass. And of course a man-whore. All Seminus demons are like that in order to survive. 
 Serena has a secret since she was seven years old. She used to be a kid on the verge of death until she was given a charm, Heofon, by an angel which made her kind of immortal. Her immortality is connected to her virginity. As long as she is untouched, the illness will not come back and she will live forever. 
 Unfortunately bad boy Wraith sets his eyes on her, since he learned that he needs her charm in order to survive. He has been poisoned by an assassin and his only survival is Serena's charm. 
 At the beginning, he will pose as her aid and he will help her with her adventures. Innocent Serena will be fascinated by him and she will be tempted. Seminus demons can be very persuasive and Wraith has also the advantage of visiting her dreams and making her see what she is missing. But Wraith will also be captivated by her. He will start finally caring for someone except himself. 
 Serena is going to have the final say! But Wraith is so crazy in love with her that he will never let her die 
 - even if he has to bend some of his personal rules 
 - even if he has to beg 
 It is great seeing the change in Wraith's personality. It is awesome accompanying Wraith and Serena at their adventures. It is interesting to understand what is Heofon and guess who will have it in the end. 
 Note: Gem & Kynan's story occupies also a large proportion of the book. Gemella Endri aka Gem is half demon and the sister of Tayla. Kynan is one of the Aegis Elders (Aegis is the demon-hunters' organization). The development of their story will not be easy because Kynan is not fond of demons.