Purity (Immortal Mother House) by M.E. Sháen

When a new type of vampire is discovered, it is up to the immortal Mother House to control or destroy. Fria of the Mother House has been sent to burn out a vampire coven near the coast. Instead, she discovers Tom, undeniably a vampire and undeniably attractive. Will they find love or will the coven and the Mother House stop their forbidden relationship?