Jean-Marie Bigard plays Clérambard, a ruined squire, his family's slavery slave, cat taster, parish priest eater. Converted after an appearance of Saint Francis of Assisi, he becomes as violent in good as he was in evil. A tailor-made role! He no longer touches animals, even if they are insignificant, he finds purity in girls of joy, pleasure in destitution and he will preach this message on the roads, in a caravan, taking his family on its crusade of love .

In Saint-Nazaire in 1967, a hotbed of workers' struggles, Clémence, 26, is married to a young worker, Gérard. Like many women of her generation, she does not work and takes care of her two children. But she longs for a different life while Gérard confuses the happiness of his family with the acquisition of household appliances. Trained by an old friend, Agnès, in family planning meetings, Clémence will meet a young philosophy teacher, Jérôme. For him, she will abandon her husband and her children, and try to live the utopia of a life of total freedom. Blinded by his pain, a stranger to his wife's questioning, Gérard will have to become aware of the upheavals that will overwhelm society a few months later. Life will never be the same again.