In the criminal underworld of Hong Kong, the decade-long feud between the “Dark River” and the “Black Mamba” has never been a simple struggle over profits. It's the story of people with “no choice,” clutching a glimmer of light in the darkness, only to have their palms cut open by a blade. The path of every character carries echoes of criminal cases from around the world: gang shootouts in New York's Chinatown, a gold heist in Bangkok, cross-border revenge killings along the Mekong, and smuggling networks in Hong Kong. In the end, they all converge into the whirlpool of these two dark rivers, dragging everyone in.