In 1900s Tianjin, a shipping magnate is found mysteriously drowned and chained underwater, and police dive captain Guo Deyou becomes the prime suspect. As the victim’s son, Ding Mao, investigates, more strange drownings occur, forcing him to team up with Guo, a spirit medium, and a journalist. Their search uncovers a dark secret tied to a deadly cult from decades ago, now resurfacing to wreak havoc. Together, they must uncover the truth and stop the rising threat.

民国初年，武陵山匪患横行，少年老幺全族被土匪“白虎队”杀尽，自己侥幸生还，被迫从军十载。老幺身负血海深仇，单枪匹马用自己的智慧和计谋让“白虎队”全军覆没，同时也揭开了土匪的真相……