



San Francisco Police Department 'Detective Rebecca Madsen' (Sarah Jones), still reeling from seeing her partner die months earlier on an unrelated case, is sent to investigate a case of a homicide of a former warden at the Alcatraz prison, led by the FBI's 'Emerson Hauser' (Sam Neill), with 'Lucy Banerjee' (Parminder Nagra). But a fingerprint leads her to an Alcatraz inmate who clearly couldn't be the perpetrator. Or could he?

Madsen has a special interest in the case, as her uncle 'Ray' (Robert Forster), who raised her, and her late grandfather, were former guards at Alcatraz. Teaming up with noted Alcatraz expert and comic book 'geek', 'Dr. Diego Soto' (Jorge Garcia), the duo investigate behind the scenes, whether the impossible is happening: that inmates are reappearing, unaged, years after they should have died.