When our unlikely trio tracks former inmate Paxton Petty, a sick landmine bomber who has returned only to place bombs throughout populated areas of San Francisco, methods of the past are applied to the present.
Doc and Rebecca close in on a man who may be the key to revealing the secrets behind all the returning criminals. Meanwhile, Hauser makes a discovery beneath the halls of Alcatraz that brings him ever closer to the truth.
Guy Hastings, an Alcatraz guard, reappears. Although a good man, Hastings is being asked to do bad things and will come face-to-face with an old acquaintance.
Herman and Pinky Ames, who were notorious for nearly escaping in 1963, find something mysteriously amiss when they return to Alcatraz in the present day.
Years ago when the most dangerous prisoners of Alcatraz mysteriously disappeared, they resurface in the present day as part of a larger conspiracy, leaving a police detective, an expert on Alcatraz and an FBI agent to track them down.