A gripping psychological thriller from the Booker Prize-winning author of The Luminaries. Birnam Wood is an undeclared, unregulated, sometimes-criminal, sometimes-philanthropic gathering of friends, an activist collective plants crops wherever no one will notice, on the sides of roads, in forgotten parks, and neglected backyards. Robert Lemoine, an enigmatic American billionaire, has snatched up seemingly abandoned land to build his end-times bunker and, intrigued by Birnam Wood, he suggests they work this land. But can they trust him? And, as their ideals and ideologies are tested, can they trust each other?