,The Five are camping again, this time on Billycock Hill, which is near the farm of Toby, a boy who thought he was a hero. When Jeff, a Royal Air Force-pilot and Toby's cousin, flies off late on a stormy night with the newest aeroplane which is full of secrets, the Five are stunned. The media claims Jeff has flown away and people think he is a traitor. Could Jeff really be a spy? The Five and Toby disagree – Jeff had always seemed to be a trustworthy man
