This is a story about tiny creatures that live in the darkness of the soil. When a tree cries out in pain, some unexpected heroes come to the rescue. Nema and her gang of young nematodes (tiny worms) embark on a dangerous journey underground. The Xenos, a group of wise but deadly bacteria, hitch a ride. The story of how they help the tree is full of action, life-or-death challenges and microscopic warfare. It is a story of co-operation and ancient partnership, about events happening all over the Earth, in the hidden worlds beneath our feet. Reading level varies from child to child, but we recommend this book for ages 8-12. Part of the Small Friends Books series - Stories of Partnership and Cooperation in Nature.