But it's spreading. Soon, people start to go missing and trees appear in unlikely places.
As cities decay and the world becomes greener, Caelyn becomes more and more convinced that arborescence is exactly what will save the planet from human destruction. Bren isn't so sure.
Drifting apart, Bren and Caelyn are forced to question what it really means to be human - and if they are ready to stand still.
'A dazzling blend of cosmic eco-horror and arthouse sci-fi, Arborescence is one of the most profound and beautiful books you'll ever read. A devastating and unforgettable elegy for the planet' Chris Flynn, author of Orpheus Nine.