Billy Custigan is a rookie cop, but his background in the city's underbelly makes him the perfect man to infiltrate the mob and bring down kingpin Frank Costello. Police officer Colin Sullivan is as straight as an arrow to most who know him, but he's Costello's main man within the police department. Each knows of the existence of the other, but neither knows his identity. This is a world where every piece of information gleaned carries with it the possibility of discovery and death and the relen find out more...