Sent by his father, Sébastien gets to know an old uncle, Captain Louis Maréchal, a fishing-boat operator, in his mansion at Morsant. He meets Jonathan and Clarisse who work in the household of Sophie-Virginie, the daughter of his uncle's business partner. Little by little, he learns the secrets behind his uncle, a former resistance fighter who lost his wife and his son 25 years ago, time stopping for him in January 1943. In the light of the different stories he hears, Sébastien first blames him but then shows understanding and affection for his old uncle.

Sébastien a grandi et sa chienne Belle est morte de vieillesse à la fin de l'hiver.