Some­thing wicked stalks the Pearl Riv­er. And if you can­not stop it, it will con­sume us all… 

Lon­don, 1856. A noto­ri­ous East End crime lord has been mur­dered, two words carved into his body: ​‘Black Blood.’ Detec­tive Ben Canaan — now one of Her Majesty’s most prized agents — is brought in to inves­ti­gate. Before he knows it, he’s on a secret mis­sion to the fledg­ling British colony of Hong Kong. In this wild, law­less place on the brink of war, he must unrav­el the links between a string of bru­tal killings and the dead­ly, all-pow­er­ful opi­um trade that has the Pearl Riv­er Delta in its grip. As he comes clos­er to the truth, Ben real­izes he has unleashed forces far big­ger, and more ter­ri­ble, than he could ever have imag­ined — forces that want him dead.