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The Secret Seven are ready to solve any mystery, any time - in Enid Blyton's classic series of 15 novels, now reissued with fabulous new covers and illustrations. Perfect for young fans of mystery, adventure or detective series.In book three, the Secret Seven have a new meeting place - a treehouse! But someone else is using it too. The gang are furious, but then they learn the intruder is in big trouble and needs their help.