As Chicago?s special-ops leader Detective Billy Harney knows well, money is not the only valuable currency. The billionaire he?s investigating is down to his last 20 million. But he?s also being held in jail. For now. Billy?s unit is called in when an escape plan results in officers down and inmates vanished. In an empty lot, Billy spots two Kevlar vests. Two helmets. Two assault rifles. And a handwritten note: 'Hi, Billy, Are you having fun yet?'....