Sam is a baby mouse, and he finds Ugo – when he's not yet Ugo – in a damp basement. Together with his boisterous siblings, the mouse is suspicious of the arrival of Esther, a turtle alone in the world, were it not for a small egg that she protects with infinite love and care. But suspicion gives way first to curiosity and then to thoughtfulness. And it is there, among the mice, in the dark,...