The story begins with a chilling proclamation spreading from the bandit-infested mountains of Kang to the crowded streets of Canton: "Black John O'Donnel must die." This ominous message is whispered among coolies, discussed by merchants over tea, and hissed by shadowy figures in dark alleys. It becomes clear that Black John O'Donnel is a marked man, targeted for death.

In a concealed room, the protagonist and his companion, Yuen Yin, discuss their dire situation over a wine-stained table. The protagonist, feeling trapped and restless, declares his unwillingness to hide any longer. Yuen Yin cautions that the danger has only begun, reminding the protagonist of their powerful foe. This prompts the protagonist to recall a recent, violent event.

The narrative flashes back to the small mountain town of Kao Sung, where chaos erupts as bandits descend from the hills. The town's soldiers are too slow to respond, and the bandits aim to loot an old monastery housing foreigners, including women and children. The bandits break through the gates, facing scattered resistance from a few defenders, including the protagonist and Yuen Yin, who has just returned from England.

Yuen Yin, armed with a German automatic pistol, manages to shoot a giant wielding a scimitar before his gun jams. A group of attackers, led by a tall youth, charges at him. The protagonist grabs a heavy oxen yoke and delivers a deadly blow to the leading attacker, crushing his head.