The Forgotten Addiction (Bird) by Michael Lion

This is one dark tale...
Protagonist Bird is an information broker, not an official PI. In this book he is hired to find a missing daughter but ends up investigating her father's death.
While that in itself is not the most original plot the satisfying slow but gritty way the story is told as well as the originality of Bird's occupation and the sheer coolness of this character makes this one a great read.
Often I was reminded of Vachss' Burke novels or Lawrence Block's Scudder series. Yep, that good.
Bird is really a hardboiled detective, owing more to the Black Mask boys then Parker or Crais. The story is set in the nineties which makes sure the internet and cell phones don't spoil some of the story, so Bird has to knock on a lot of doors to find the answers he needs.