Joe DeMarco's long­time employer John Mahoney has kept an explosive secret: he has a son, and that son has just been shot dead in a bar in Manhattan. Mahoney immediately dispatches DeMarco to his native New York to provide the prosecutor with any assistance necessary, but with five bystanders willing to testify against the accused, the case seems like a slam ­dunk--that is, until it appears someone has interfered with the witnesses.