Five Go to Billycock Hill (#16 Famous Five)
By ENID BLYTON.
Description
On holiday again, the Five are back at Billycock Hill, and making friends already. They can't believe it when they meet Jeff - a real pilot! Maybe they'll get to go flying too! But now Jeff has disappeared with some 'top secret' equipment! Could he be a spy? - from Amzon
ISBN(s)
0340894695, 9780340894699