Five years ago, Mira Bunting founded a guerrilla gardening group: Birnam Wood. An undeclared, unregulated, sometimes-criminal, sometimes-philanthropic gathering of friends, this activist collective plants crops wherever no one will notice, on the sides of roads, in forgotten parks, and neglected backyards. For years, the group has struggled to break even. Then Mira stumbles on an answer, a way to finally set the group up for the long term: a landslide has closed the Korowai Pass, cutting off the town of Thorndike. Natural disaster has created an opportunity, but Mira is not the only one interested in Thorndike.