Five Go to Billycock Hill
Enid Blyton
Paperback
(Hodder Childrens Book, Nov. 15, 2001)
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 by a spy - a traitor!. Whatever his motives are, the gang feel duty-bound to investigate...