The Druid Next Door — E.J. Russell

Former Queen's Enforcer Mal Kendrick doesn't think his life could get any worse: he's been exiled from Faerie with a cursed and useless right hand. When he's not dodging random fae assassins in the Outer World, he's going toe-to-toe with his tree-hugging neighbor. And when he discovers that the tree hugger is really a druid, he's certain the gods have it in for him -- after all, there's always a catch with druids. Then he's magically shackled to the man and expected to instruct him in Supernatural 101.

All right, now things couldn't possibly get worse.

Until a mysterious stranger offers a drunken Mal the chance to gain back all he's lost -- for a price. After Mal accepts, he discovers the real catch: an ancient secret that will change his and Bryce's life forever.

Ah, what the hells. Odds are they won't survive the week anyway.