An English teacher seduces a young student in the company of his wife to help him in an ambitious plan with the kidnapping of a newborn baby of a wealthy businessman.

When his uncle Paul died, Lucien Berlemont inherited a telescope and a sextant, which only aggravated his aversion to the high seas. At the age of 20, he began taking clandestine navigation courses. During his vacations in St-Lunac, even Mr. Dumesnil's daughters struggled to distract him from his marine reveries. But one evening, he inadvertently finds himself locked up with Marie-Angeline; the consequences of this prolonged evening force him to make a decision and commit himself, for better or for worse, to one of the Dumesnil girls.