Circle of Trust (Genesis Circle Series, book 2) - Aimee Nicole Walker, Nicholas Bella

Lorcán Kennedy is a take-no-prisoner vampire whose grit is tested when slain vampires start showing up in his sector. His investigation reveals a blessed weapon was used in the slayings, which leads him to a rogue hunter with a grudge against vampires. Christian Wolfe is a no-nonsense hunter who believes the only good vampire is a dead one, but his code of honor keeps his hatred in check. When his integrity is questioned, he will do anything to defend it, including work with his enemy.