France at the beginning of the 20th century. Young Jean Rezo, nicknamed Grab-and-Swallow, and his older brother, Puddle, live carefree in the family estate under the supervision of a kind, forgiving grandmother. But she suddenly dies, and the children's idyll comes to an end. The boys' parents are returning from a business trip abroad. What can you expect from a mother who hasn't seen her sons in several years? Love, affection, tenderness? Maybe. Not from Paul Pluvignek. After all, under her strict supervision, the children's lives turn into a living hell. With support, Grab-and-Swallow declares war on his mother. But, hoping to overthrow this snake, he realizes that he is terribly similar to her. She understands this too. The more skilful, sharper and more unpredictable the duel of these strong rivals will be. A duel in which the winner may regret his superiority.