David Wellington 
Vampire Zero [EPUB ebook] 
Number 3 in series

U.S. Marshal Jameson Arkeley taught police investigator and vampire fighter Laura Caxton everything she knows about monsters. When an army of vampires attacked Gettysburg, Arkeley gave up his own life to save others. Except he didn’t exactly die . . .He accepted the curse and is now a vampire himself — one that knows all the tricks better than anyone else. Now Laura is faced with the task of destroying him before he succeeds in his quest to exterminate his own family, one member at a time. But Arkeley knows all her tactics too; after all, he taught her.Worse still, if Laura fails to stop him then Arkeley will become a beast exponentially more dangerous — a Vampire Zero.