Gr. 7-10. Even readers who don't like sf will be drawn to a hero who has a sense of humor about his serious mission. In Zimbabwe in the year 2194, the military ruler's 13-year-old son and his younger brother and sister leave their technologically overcontrolled home and find themselves on a series of perilous adventures. Tendai and his siblings encounter mile-high buildings and other miracles of scientific advance; they also find fetid slums and toxic waste dumps. As they're kidnapped by gangsters, forced to slave in a plastic mine, and accused of witchcraft, they're pursued by mutant detectives, who are both bumbling and sensitive and who always seem to be just one step behind rescuing the children. In the best section, the siblings find themselves in a traditional Shona village that at first seems idyllic but turns out to also encompass fierce sexism, ignorance, and disease. Throughout the story, it's the thrilling adventure that will grab readers, who will also like the comic, tender characterizations, not only of the brave, defiant trio and the absurd detectives, but also of nearly every one the kids meet, from street gangsters and spiritual healers to the English tribespeople with their weird customs. Tendai's spiritual coming-of-age is the least interesting part of the novel, but teens will like this teenager with "a hot line to the spirit world." Hazel Rochman