The Vigilante’s Ally by Lawrence Hall

Alivia Rivers is in love with a man who is both a hero and a killer. And it’s going to take both to save the world. A spellbinding story of terror and intrigue, greed and desire, fear and love from bestselling author Lawrence Hall.
Alivia Rivers is having a bad day. A really bad day. The gorgeous man of her dreams is a blood-sucking nightmare who holds the key to stopping the spread of the greatest evil the world has ever seen.
But beyond battle there is another danger — the hatred between the two men leading the fight could not only ruin Alivia’s love life but threaten the future itself.
Whoever said all’s fair in love and war?