Brighter Than The Sun Charley Davidson Series, Book 8.5.

All his life, Reyes Alexander Farrow has suffered the torments of the damned. Only one thing has given him hope: the woman who radiates a light that no mortals can see; a light that only the departed can see... Told from his point of view, Brighter Than the Sun chronicles the first time Reyes ever encountered Charley, and how their relationship has been the one thing that can either save him or doom him.