The voyages of Pierre Savorgnan de Brassa through Africa. This great explorer, the founder of Brazzaville (Congo), was born in Italy but chose France as his motherland.

Charmed by a pretty girl, Olive follows her on board a dirigible. There, he discovers the belle, named Pearl, has a husband. Never mind such an insignificant detail, Olive tells himself as the dirigible takes off with a stowaway among the passengers. Unfortunately a storm breaks and the captain, realizing that there are thirteen people on board, decides to sacrifice one of them. And guess who ? Olive, of course...!