In a sunken castle underneath the earth, five strangers wake. They have no food. No memory. No water. And no way out. They don't know it yet, but they're capable of something they never imagined. They must organize and band together for the sinister adventure that awaits them.

Seven years after the apparent death of Chen Zhen, who was shot after discovering who was responsible for his teacher's death (Huo Yuanjia) in Japanese-occupied Shanghai. A mysterious stranger arrives from overseas and befriends a local mafia boss. That man is a disguised Chen Zhen, who intends to infiltrate the mob when they form an alliance with the Japanese. Disguising himself as a caped fighter by night, Chen intends to take out everyone involved as well as get his hands on an assassination list prepared by the Japanese.