Michael Connelly knows how to write a police procedural that you can't put down. His main line of novels feature a hard boiled LA detective named Hieronymus 'Harry' Bosch. Bosch has his own code and is forever finding crooked cops. He has, literally, a love-hate relationship with the Feds - he has bedded at least two FBI agents, one of whom he married.
Get the whole Connelly opus and you won't stop reading until you've been through them all.