From a near future to the 1930s, Michael Christie built, like an architect, the genealogy of a family with a fate darkened by secrets and intimately linked to that of the forests. 2038. The epidemic waves of the Great Dieback have decimated all the trees and turned the planet into a desert of dust. One of the last refuges is a wooded island off the coast of British Columbia, which welcomes wealthy tourists who come to admire the ultimate primary forest. Jacinda works there as a guide, with no real hope for a better future. Until the day a friend tells her that she is the descendant of Harris Greenwood, a wood magnate with a sulphurous reputation. Then begins a teeming and protean story whose unsuspected ramifications echo the events, dramas and upheavals that have shaped our world. What will we have left when the last tree is cut down?