Guardian - Aisling, #1

Constable Dallin Brayden neither appreciates nor believes in fate. At least not until he meets "Wilfred Calder" who's been been running from it all his life. When Wil is brought in for questioning as a witness to a brutal murder, and subsequently flees, Dallin is dragged by duty into the chaos of ancient myth, fanatical religion, and the delicate politics of a shaky truce between two perpetually warring countries.
And all of it seems to reach its nexus in the man he knows is not Wilfred Calder. When Dallin finally catches up to Wil, it only makes matters worse. Prickly and full of rage, Wil tells an unbelievable tale of magic and betrayal that threatens to shatter the carefully cultivated foundations of Dallin's world. Leery and only half-believing, Dallin finds himself questioning not only his own conscience and his half-forgotten past, but the morality and motives of everyone around him-including those who hold the power of his own country's fate in their hands.