In 1910, Hong Kong is in the grips of the powerful Red Dragon tong, a secret society that extorts revenue from merchant seamen, deals in both opium and slave trades and savagely slaughters all those who offer opposition. A merchant sailor, Captain Jackson (Geoffrey Toone), swears revenge on the nefarious clan after they brutally murder his first officer and daughter. Hammer's The Terror of the Tongs strives to offer a lurid period drama but falls somewhat short of the mark due to a clumsy script, an indifferent hero and a conspicuous lack of authentic Asian actors. Apart from Burt Kwouk, most of the cast are Europeans sporting rather poor prosthetics. Christopher Lee manages to bluff his way through his role as Tong leader Chung King, through the force of his acting skills. French actress Yvonne Monlaur (Brides of Dracula) is not as successful as a mixed raced serving girl.