Since the disbanding of the Special Homicide Investigation Team, J.P. Beaumont's biggest concern is pondering whether he and his wife, Mel, should finally get a dog. But one voicemail from his old friend Ralph Ames is about to change that. Through Ralph, Beau has become involved in an organization called The Last Chance, which enlists a number of retired homicide investigators to tackle long-unsolved cold cases. The one that has just landed on Beau's plate is a thirty-year-old missing-persons case.