There came an elastic aftershock of creaks and groans and then, softly softly, a chinking shower of rubbled cement. Leaves calmed and trunks stood serene. Where, not a minute before, there had been a suburb, there was now only woodland standing amid ruins… There is no warning. No chance to prepare. The trees arrive in the night: thundering up through the ground, transforming streets and towns into shadowy forest. Adrien Thomas has never been much of a hero. But when he realises that no help is coming, he ventures into this unrecognisable world. Alongside green-fingered Hannah and her teenage son Seb, Adrien sets out to find his wife and to discover just how deep the forest goes. Their journey will take them to a place of terrible beauty and violence, to the dark heart of nature and the darkness inside themselves.