Two boys discover a Roman centurion's skeleton and a futuristic flying pod in a cave while on vacation. They debate turning it over to authorities or keeping it to explore its capabilities.

Whilst on holiday, two boys find the skeleton of a Roman centurion in a cave. Buried with him is an unusual 'pod' which turns out to be a flying machine with incredible abilities. Will they hand it over to the authorities to study, or keep it for themselves and find out what it can do by trial and error?—Alan Saunders

Geoff and Tom are best friends but very different. Geoff is sporty and adventurous. Tom is cautious and a bit of a worrier. So when they make the most amazing discovery, they deal with it in very different ways. The boys are on holiday in Wales when they find - hidden beneath the body of a Roman centurion in a cave - a flying machine! The cave soon becomes a major archaeological site, but the boys tell no-one about the machine. Back home, the boys keep the machine, Aquila, in the garage, telling their parents it is an old prop left over from a film set. Aquila has a marvellous invisibility switch. Not only can they have all kinds of bizarre and hilarious adventures in Aquila, they can have them unseen.—Jeff-B