This is the story of a young earthworm named Lios who longs to know his place in the world. He spends many days alone in his room, reading books. Here he learns many things, but what he loves most are animals. Large, powerful animals that walk the earth above him. Lios feels unimportant, forgotten about in the soil, while larger animals like dogs and horses star in movies above ground. His father, Toor, wants so badly to show his son that earthworms are important too. He takes his son on a journey where Lios learns just how important their ecosystem is and that without it, there could be no life on Earth.