The police track down a notorious burglar in order to apprehend him. However, he is given a chance to make up for his ways by working with the police on a case involving stolen diamonds.

While vacationing in Paris, King Kong is kidnapped by a British agent called James, who seeks to recover one of the stolen crown jewels, the Star of Fortune, supposedly at the request of the Queen of England. The jewel is hidden at the Hong Kong Police Headquarters and Kong will have to steal the jewel without his partner-in-crime, Detective Albert 'Baldy' Au, finding out. When James' devious intentions are revealed and Baldy and his wife, Supt. Nancy Ho, discover Kong's heist, Kong finds himself at a crossroad.

In the 1930s, China was in a state of turmoil and flurry. The dethroned Emperor Pu-Yi had established the Puppet State of Manchukuo in Manchuria and was cooperating with the Japanese in the testing of poisonous gas. The revolutionary army headed by Lieutenant Mong is assigned to crush this vicious plot. During his mission, Mong comes across witty and valiant veteran Uncle Choy and his friends, who volunteer to help. Mong believes that Uncle Choy is too old to join them. How can Uncle Choy prove himself? And can they succeed in their mission?