Book 4 of the Samurai Kids series
The Samurai Kids, "Cockroaches," travel to the Forbidden City of China in order to rescue their kidnapped friend, Kyoko. Sensei suspects his enemy, Lu Zeng, who is obsessed with the quest for eternal life. Niya, the tale's hero, begins to learn that her friend Yoshi has secrets, and so does Sensei, and she begins to question who she can trust.
