The tale unfolds in China, a place as yet unknown and mysterious to Tintin. It looks like our hero may have bitten off more than he can chew as he takes on the task of wiping out the international opium trade, which has a vice-like grip on this beautiful country. With the assistance of the secret society Sons of the Dragon, and his friend Chang (whom he encounters later on in the story), Tintin succeeds in overcoming myriad obstacles to finally triumph over his adversaries and disband their network of corruption.