Book Enid Blyton Secret Seven. Book 5. Keep it Up, Secret Seven!

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What should members of a secret society do if there are no secrets at all and nothing to investigate? Sit back and hope for a miracle? Of course not! You should improve your skills by practicing observation, - this is what the head of the Secret Seven decided, Peter. But George, faithfully fulfilling Peter's task, jumped into trouble, because of which his father strictly ordered him to leave the company. However, this did not stop the members of the Secret Seven, and they did conduct their next investigation, exposing a gang of elite dog thieves.