Detective Rebecca Madsen and Alcatraz historian Dr. Diego "Doc" Soto team up with a secret agency that is dedicated to finding and catching inmates from the infamous prison who went missing 50 years ago and are reappearing today.

When child killer Kit Nelson, a terrifying kidnapper who always returns his victims home - after he's killed them - reappears from the past, the team is in a race against time to catch the man before he kills again