Dragon Dance (1986) is the last novel of the Fireball Trilogy by John Christopher.

Plot

At the end of New Found Land, Simon and Brad are in North America where thay are captured by sailors from the Far East.

When they awaken after losing consciousness during the capture, they find themselves aboard a Chinese junk crossing the Pacific Ocean. The junk is a paddle steamer that sails without human intervention. The crew have apparently put themselves into hibernation, indicating that they are accustomed to the trip and are expecting an uneventful journey.

On their arrival in China they are taken to the Imperial Court, where the boys display their knowledge of modern technology. There, Brad becomes besotted with the Dowager Regent and became estranged from Simon.

Unlike the other civilizations that they have encountered, which remain at a pre-Dark Ages technological level, the Chinese have continued their technological innovations and have come up with new inventions, even though their social development has stagnated.

Simon is sent to the north to serve the general of the powerful Northern Army in charge of resisting nomadic barbarians.

The arrival of the boys catalyses the ongoing court intrigue between the dowager regent and court officials. A series of bad news arrives in the north from the capital this implys that the young emperor is being held incommunicado, or has been secretly deposed and killed by the dowager regent.

The general of the Northern Army, the most powerful army in the empire publicly declares that the dowager regent as a usurper, and mobilises his army to rescue the emperor, whose fate is unknown. He candidly admits to Simon that should the emperor be dead, that he the general would be the most likely to succeed to the throne.

Simon attempts to help the general by the introduction of armoured tanks, but lacks detailed knowledge. Nonetheless Chinese engineers in the service of the general were able to build on the concept to produce some prototypes.

The Chinese themselves use flying kites to give the appearance that dragons are aiding their military.

However, the expedition becomes a disaster at the gates of the capital. Simon discovers that Brad has introduced airplanes to the dowager regent's forces. While the airplanes work, Simon's tanks do not.

Having rid herself of all opposition, the dowager regent callously discards Brad and attempts to have him killed.

The two boys manage to escape once again, only to encounter another fireball similar to the one which brought them into this world.

Though he is given the option to go home, Simon follows Brad when the latter refuses to go home and instead decides to try for better luck in a new realm.

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