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Candace Hull, teenaged daughter of an American diplomat working in London, arrives there on holiday from the Swiss boarding school she attends with other daughters of London-based diplomats. She visits Mai-Ling, niece of the Communist Chinese ambassador, and stumbles onto a major political secret involving a murder. To help CIA man Wally Sanders, upon whom she has a crush, she passes on this information and other espionage coups made possible by her freedom of movement at the various embassies. After a time Candace becomes known as "Kitten"--a much-hunted spy. Wally finally realizes that only Candace can be "Kitten," and the Chinese ambassador simultaneously comes to the same conclusion. Back at school in Switzerland, Candace faces assassination but, with the help of her classmates, is rescued by Wally.