|Marianne Flambelle, girl of a fencing master of the La Rochelle, is fifteen years old when she returns from America with her uncle Jacques, companion of Fayette. She vows to find her parents who have disappeared.
A evil character, Courtard, swore that he will seek his revenge after losing to the Flambelles. He wants to find the enormous treasure entrusted by immigrants to the father of Marianne. Everywhere Marianne goes, the fencing taught to her by her father proves to be astounding. The girl will find her parents… and the treasure!