Pretty Little Dead Things by Gary McMahon
THOMAS USHER HAS A TERRIBLE GIFT. Following a car crash in which his wife and daughter are killed, he can see the recently departed, and it's not usually a pretty sight. When he is called to investigate the violent death of the daughter of a prominent local gangster, Usher's world is torn apart once more. For the barriers between this world and the next are not as immutable as once he believed.