Kindling The Darkness by Jane Kindred

He wants redemption…she only knows damnation

Oliver Connery left a secret paramilitary group because he couldn't stand the thought of torturing supernatural beings. Lucy Smok's mission is to send infernal creatures back where they came from. When Lucy learns that Oliver has been harboring hellhounds, she wants to think of him as an enemy – and Oliver wants to think the same of her. But their feelings for each other are another story…