Opening credits prologue: Brighton today is a large, jolly, friendly seaside town in Sussex, exactly one hour's journey from London. But in the years between the two wars, behind the Regency terraces and crowded beaches, there was another Brighton of dark alleyways and festering slums. From here, the poison of crime and violence and gang warfare began to spread, until the challenge was taken up by the Police. This is a story of that other Brighton - now happily no more.