Source: VHS Off-Air Recording 480p. Supplied by Mark Carman. Note: Poor quality but best available as no DVD release yet.
The Camerons visit their Aunt Jane, a rural relative, but come across intrigue at the near by RAF base, where the Jupiter unmanned, silent spy plane is kept under wraps. Two mysterious men who the children saw on the train up are after the plane’s engine, and the race is on to thwart them.