Target Hong Kong

In Communist China, Suma, a Russian officer, oversees the brutal subjugation of local villages, where protesters are summarily executed. As part of a plan to raise as much American money as possible, Suma misleads Lao Shan, a fervent nationalist and owner of the Green Dragon gambling house in Hong Kong, into believing that he supports the nationalist cause. Lao Shan, whose adopted daughter Ming Shan is American, agrees to provide arms and a local militia for his proposed takeover of Hong Kong. Meanwhile, at the Green Dragon crap tables, Ming Shan observes American Mike Lassiter lose $25,000 in bets. Ming Shan is alarmed when Mike's former partners, Dutch Pfeifer and Dockery Pete Cresham, arrive and after a scuffle, forcibly take him away. They then meet with the leaders of a small nationalist force, Sin How and his partner, Johnny Wing, who are aware that Mike is an undercover anti-Communist spy. After confirming that Mike is not a double agent, Sin How asks him to work with them as they know that a large amount of American currency has been filtered through the Green Dragon and suspect the money is being used by the Communists. Sin How explains that their organization's last infiltrator was killed before he could provide proof, but convinces Mike to help them, noting that with a complex microphone and wire system, he will be able to hear and report to them simultaneously about action at the tables. Later, the leader of Lao Shan's militia, Lo Chi, informs her that his men are refusing to obey her orders until they receive another $50,000. Lao Shan requests the money from Suma's aide and top Red Chinese agent Fu Chao, who reports to Suma at the New Moon theater. Mike, meanwhile, returns to the Green Dragon, where Ming Shan introduces him to Lao Shan, who finds him suspicious. That night, Suma meets Lao Shan and informs her that the complex series of water tunnels underneath the gambling house will provide the means to attack the city by sampan boats. Uncertain whether Suma will pay her troops, Lao Shan declares she is withdrawing from the plan, but Suma convinces her that her militia will distract the Red Army from a larger attack he is staging to the north and agrees to the money request. Then he shows her an enormous bomb which, when set, will float down a tunnel and detonate upon striking the gate underneath military headquarters. The next day at the Green Dragon, Fu Chao places a number of bets and loses. Wired, Mike sends a message to Dockery, who follows Fu Chao to the New Moon. Dockery reports back that Suma owns the theater, but apparently has no past. Mike suspects Suma's real identity might be Machenko, Singapore's top Communist. Meanwhile, Lao Shan asks Ming Shan to deliver a packet to Lo Chi in a town on the mainland and remain there until summoned. Mike follows Ming Shan and confronts her after she delivers the packet, but she insists that she had no idea the packet contained money. Just then, on Suma's orders, soldiers begin an attack on the town. Mike and Lo Chi hold off the soldiers while Ming Shan escapes. Lo Chi is killed and Mike, although wounded, heads back to Hong Kong. Meanwhile, Sin How and Johnny follow Suma and Fu Chao to the New Moon and through a wire tap, hear them discuss how the false "uprising" by Chinese Nationalists will provide an excuse for the Red Army to move in to protect the locals. After Ming Shan returns to the Green Dragon and tells Lao Shan about the attack, Suma discovers the wire tap at the New Moon and captures Sin How and Johnny and places them on board a special Red Army train. Mike reports to Dockery and Dutch and, having discovered where Sin How and Johnny are being held, plans to intercept their train. On the Red train, Fu Chao threatens Sin How and Johnny, but just then, a freight car full of soldiers sent by Mike cuts off the Red train, and a shootout ensues. Mike finds and kills Fu Chao and frees Sin How and Johnny. Meanwhile, at the tunnels, Lao Shan commences the attack on military headquarters as planned. Mike returns to the Green Dragon, but Ming Shan refuses to tell him her mother's whereabouts. After Mike and his men discover the entrance to the tunnels, they find Lao Shan handing out weapons. Believing he is a Communist spy, she fires on Mike. During the ensuing exchange, Dockery is killed and Dutch wounded. Though stunned, Lao Shan refuses to tell Mike more about the plans. Nearby, Suma activates the bomb and sends the raft through the tunnels, before being found and shot by Mike. To force Lao Shan to reveal the location of the bomb, Sin How threatens Ming Shan's life, and Mike prevents the bomb from exploding. Later above ground, Sin How tells Lao Shan that she and her men should remain to truly contribute to the fight for a Free China and, placing Ming Shan in Mike's care, Lao Shan agrees.