“There are betrayals in war that are childlike compared with our human betrayals during peace. The new lover enters the habits of the other. Things are smashed, revealed in a new light. This is done with nervous or tender sentences, although the heart is an organ of fire.”
As the story unravels, you learn that Toby lives in the Tree but his family was forced out of the Upper Branches to the bleak Lower Branches because his dad was a scientist who refused to reveal a secret that could destroy the lives of them all.