Once still a doctor, Pierre Laurent became a healer and settled in Brittany. His fame was soon commensurate with his therapeutic successes. His former colleagues, seeing the clientele flee, become agitated. Pierre Laurent doesn't care. His devotion to his patients aroused the admiration of a tender young girl, Isabelle. From admiration to love, there is only one step, which is often called engagement and which the two young people take together. The ace. The fate hounds the unfortunate thaumaturge. A misunderstanding separates him from the one he loves while his enemies manage to bring him to justice for the illegal practice of medicine.