Hurrah! It's holiday time & 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 & concerned too. Could their new friend by a spy
- a traitor! Whatever his motives are the gang feel duty-bound to investigate.. . These classic editions feature Enid Blyton's unchanged text & Eileen A. Soper's original illustrations.