The sad life and death of Balthazar, a donkey, from an idyllic childhood surrounded by loving children, through adulthood as a downtrodden beast of burden. His life is paralleled with that of the girl who named him, and as she is humiliated by her sadistic lover, so he is beaten by his owner. But he finds a kind of peace when he is employed by an old miller who thinks he is a reincarnated saint.