The twins make their way to Greece. They are separated from Martin at this point and are forced to find passage to Turkey by themselves. In Turkey, Julie is kidnapped and made a member of the harem of a local prince (who is revealed to be about the same age as the twins). Jules, with the help of a traveling Arab caravan, is able to rescue Julie, and the prince and his father are extremely apologetic. As they continue through the desert, they are reacquainted with the Great Sabatier, who sacrifices himself to save the twins' lives from the eunuchs and bandits of the desert. They then journey through Northern India, and then reach the mountains of Tibet, where Julie is severely injured by an enemy's knife wound. The twins spend several days in a Buddhist monastery, where Julie is able to recover. At this point, they are reunited with Martin and Professor Ledeaux, but also meet Ho Cheng, whom the twins are unaware of. Initially presenting himself as a traveler, Ho Cheng, the Magician, tries to kill Jules and Julie. They escape, however the Magician manages to steal the tablets during the struggle. The twins, with their power disabled, carry on with Martin and his party. They discover the tablets may be held by Ho Cheng in a hidden temple. They are ambushed, separated from Martin, and Ho Cheng holds them prisoner. After a violent struggle, they are able to recover the tablets, and battle Ho Cheng in his "chamber". Ho Cheng is revealed to be a demon with the true form of a large brain. Using the Seventh of the Seven Powers, the twins are able to damage the brain. Severely weakened, Ho Cheng tries to kill the twins (who are exhausted from their use of the Seventh Power), but is destroyed by Kung Lee the pirate, who makes a reappearance. The Empress hears of the death of her trusted court magician, and fearful for her safety, increases the palace guard.