Another chance to see the BAFTA award winning presenter travelling to northern California to visit America's notorious San Quentin State Prison. Built in 1852, San Quentin is one of America's oldest prisons and suffers from chronic overcrowding. Although famous for its death row the prison's main task is to house a transient population of 3,000 murderers, sexual predators and small-time criminals. Louis spends two weeks with these inmates and quickly discovers that they inhabit a strange world within a world with its own rules and its own brutal code of conduct.