Ripper Street (2012)

S2E1 Pure as the Driven

Although Jack the Ripper's infamy is dwindling, east London remains troubled. When a policeman is attacked, DI Reid and his team at H-Division delve into the growing Chinatown, where Jackson uncovers signs of a potent new opiate. Reid is alarmed at the prospect of a fresh wave of chaos sweeping through his neighborhood.