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Meet Julian, Dick, Anne, George and Timothy. Together they are THE FAMOUS FIVE - Enid Blyton's most popular adventure series. All 21 titles also available as audiobooks!In book sixteen, it's holiday time at Billycock Hill and the Famous Five make new friend - a real pilot! But when he disappears with top secret equipment, the Five begin to wonder if their new friend could be a spy, or worse, a traitor.Whatever his motives, the gang feel duty-bound to investigate...This edition features the original cover art and inside illustrations by Eileen Soper.