Dark-Hunter
This is a Series Sherrilyn Kenyon (aka Kinley MacGregor) published. The series started in 2002 with Fantasy Lover. The series is in four parts; In part one the red wire is Acheron Parthenopaeus, part two will be about Savitar, Parts three and four involve characters the reader isn't yet familiar with. The series is still in part one but rumours are that it will go over in part two soon because Acheron's book wil be published soon.
The books;
1. Fantasy Lover, (St. Martin's Paperbacks, 2002)
2. The Beginning, also in the back of Sins of the Night (St. Martin's Paperbacks, 2002)
3. Dragonswan, (Reprinted by Berkley 2005)
4. Night Pleasures, (St. Martin's Paperbacks, 2002)
5. Night Embrace, (St. Martin's Paperbacks, 2003)
6. Phantom Lover'', in the anthology Midnight Pleasures (St. Martin's Paperbacks, 2003)
7. Dance with the Devil'', (St. Martin's Paperbacks, 2003)
8. A Dark-Hunter Christmas, also in the back of Dance with the Devil (St. Martin's Paperbacks, 2003)
9. Kiss of the Night, (St. Martin's Paperbacks, 2004)
10.Night Play,(St. Martin's Paperbacks, 2004)
11.Winter Born, in the anthology Stroke of Midnight (St. Martin's Paperbacks, 2004)
12.Seize the Night, (St. Martin's Paperbacks, 2005)
13.Sins of the Night'', (St. Martin's Paperbacks'', 2005)
14.Second Chances, St. Martin's Paperbacks, 2005), free giveaway.
15.Unleash the Night, (St. Martin's Paperbacks, 2005)
16.Dark Side of the Moon (St. Martin's Press, 2006, reprinted by St. Martin's Paperbacks, 2007)
17.A Hard Day's Night-Searcher, in the anthology My Big Fat Supernatural Wedding (St. Martin's Griffin, 2006)
18.Until Death We Do Part, in the anthology Love At First Bite (St. Martin's Paperbacks, 2006)
19.Fear the Darkness, free e-book (St. Martin's Press, 2007)
20.The Dream-Hunter (St. Martin's Paperbacks, 2007)