Carmen runs away from the language research center where she grew up as a smart and cheeky teenager. Outside she discovers fear and hunger and the enigma that is man. She ends up in a cage. There she makes eye contact with a man, Mercier, a father to be, applying for his first job. She scandalously enters his life. Mercier learns to appreciate her real worth. But how much can she learn from him and his kind? Carmen is a young Bonobo, cousin of the chimpanzee.