The scientist who refused his discovery
Sim Lolness, a scientist in a people only millimetres tall who live in a single oak, discovers that the tree is a living being and that its sap could be turned into a powerful energy source. He refuses to hand the secret to the Tree Council, knowing its use would kill the tree, and his family is exiled to the Low Branches and later imprisoned. His thirteen-year-old son Toby escapes and is hunted through the tree, where the powerful exploit its wood and dig an ever-widening crater in its trunk.
