- The Boy: A young child with an abundance of curiosity about the world.
- The Mole: Gluttonous and full of life.
- The Fox: Weary from hardships.
- The Horse: Wise and gentle.
The four set out together on a journey to explore the world, asking each other questions, enduring and overcoming difficulties. Through the simple, profound dialogues and the distinctive illustrations of Charlie Mackesy, the book offers valuable messages about friendship, love, hope, kindness, and the meaning of the moment.