Casti and Trébois, two friends who are workers at the same factory, have developed a common passion for flying. They dream of starting an aviation club. In the meantime they spend all their Sundays restoring an old plane under the supervision of Raf, a former RAF pilot...

A young reporter solves a mystery crime. The fictional reporter is Joseph Rouletabille. He works on a complex, and seemingly impossible, crime in which the criminal appears to disappear from a locked room.