For those of you who are fans of HBOs "The Wire" I would strongly recommend the novels of George Pelecanos, who has been on the writing staff of the show this season.
Last month I read KING SUCKERMAN and just recently finished it's sequel, THE SWEET FOREVER. I'm about to start the last in the trilogy, SHAME THE DEVIL.
These three are all crime novels set in Washington, D.C. in the 70s, 80s, and 90s and follow the exploits of black Vietnam vet/small record store owner Marcus Clay and his Greek-American friend Dimitri Karras. Minor characters in the first three novels are continued in his subsequent books such as RIGHT AS RAIN, HELL TO PAY and SOUL CIRCUS.
If you like "The Wire" you can see threads of Pelecanos' work throughout. Although Pelecanos wasn't writing for the show during its first season, you can see characters like Omar have their roots in KING SUCKERMAN. After reading two of his novels now, I'm pretty convinced I can pick out lines of dialogue in "The Wire" that he has written.
If you like crime fiction, Pelecanos is a modern master.