Cyfres Genod Gwyrdd: Achub Afon!

The second fantastic book in the series about four friends who want to make the world a better place. Ffion and Lili are taking the boisterous dog, Bili, for a walk when he lands in the river. It is so choked with rubbish that Bili can''t get out. A brilliant series about the small changes that make a big difference, with themes of environmentalism and friendship.