There was relief at Heathrow when the damaged British Airways 707 touched down safely. But something was wrong. The pilot wasn't answering the control tower's radio call - and the authorities soon found out why. An armed hijacker was on board the plane, together with five accomplices and a bomb.

The hijackers wanted a terrorist returned in exchange for the lives of the aircraft's passengers and crew. The exchange could be made safely. Until the prisoner escaped...