John Connolly is more into the dark side and not for the squeamish ; I'd say Stephen King meets Michael Connelly, add Charlie 'Bird' Parker former New York detective and his two ex-con pals, Angel and Louis, into the mix and you have an interestng read. Very interesting.
You should start with 'Every Dead Thing' as it was his first, but I started with 'Dark Hollow'
'
Every Dead Thing'
'Haunted by the unsolved slaying of his wife and young daugjhter, Charlie Parker is a man consumed by violence, anger and the desire for revenge...'
His ex-partner asks him to track down a missing girl. His search leads him into the bowels of organized crime and to a black woman who dwells in the
the Lousianna swamps, to cellars of torture and death; and to a serial killer unlike any other, an artist who uses the human body as a canvas and takes faces as his prize.....' That's from the jacket.. sorry, I guess John Connolly
might belong in the Horror section rather than here
'Dark Hollow' ...Second book... 'A young woman, Rita Ferris, and her little son die at the hands of an unknown killer, and the past and present collide violently for Charlie Parker. The answer lies thirty years into his past, to a tree bearing strange fruit, and the mythical killer, the monster known as Calab Kyle. ...'
Just waiting for good old Amazon to deliver them 
