Perfect Shadow (Night Angel Trilogy)

"Gaelan Starfire is a careful, quiet, simple farmer. He's also an immortal, peerless in the arts of war. Over the centuries, he's worn many faces to hide his gift, but he is a man ill-fit for obscurity. When Gaelan must take a job hunting down the world's finest assassins for the beautiful courtesan and crime lord Gwinvere Kirena what he finds may destroy everything he's ever believed in." --