The Guilty Werewolf — R.J. Scott

Declan Finlay is the best Retriever that Glitnir has. Well, he is now that Connor Strand has gone rogue.

He is sent to hunt Connor - the guilty werewolf. But he doubts that his best friend could ever be guilty and he resolves to track him down and find out why he ran with the renegade vampire.

When the Fae Alliance, reporting to Glitnir, demand that he not go alone he is forced to accept the incubus, Levi Tiernan, an assassin, as his companion on the journey. If Declan doesn't kill Connor, then Levi will.
What happens when old lust and love dictate action and suddenly Declan is questioning everything he knows.