Five Go To Billyclock Hil (English, Paperback, Enid Blyton)

Hurrah! It’s holiday time, and the Famous Five are spending it at Billycock Hill. Most exciting of all, they’ve made a new friend – a real pilot! But now he has disappeared, with top secret equipment…

The Five are puzzled, and concerned, too. Could their new friend be a spy – a traitor? Whatever his motives are, the gang feel duty-bound to investigate…

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