The film tells the story of Pascal, a small child who's fascinated by his grandfather's lighter-than-air balloon.

The older man claims he's invented the best mode of transportation: a balloon that can be controlled when in the sky.

As the grand-père takes the balloon on a demonstration, Pascal climbs on board and lifts them both upward to an adventure.

However, the balloon turns out to be not so controllable: church spires become objects of threat, factory smokestacks become volcano-like, a stag hunt is no longer about the thrill of the chase, and they inadvertently kidnap washing on a clothesline and a guest at a wedding party in Brittany.

In a brief film review of the film the weekly news magazine Time wrote, "Stowaway in the Sky will enchant moppet, matron and greybeard with its breath-catching, balloonist's-eye view of the fair land of France.