Meet Julian, Dick, Anne, George and Timothy. Together they are THE FAMOUS FIVE - Enid Blyton s most popular adventure series 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.