The novel's opening movement introduces nine separate characters through their relationship with a single tree: Nick and the Hoel chestnut, Patricia and her botany, Mimi and the Chinese mulberry, Adam and his studies of collective action, Ray and Dorothy and their marriage-test chestnut, Neelay and the maple he falls from, Douglas and the banyan that saves his life, Olivia and the electrical accident that rewires her, and the backstory of the Brinkman-Cazaly household.

Several character strands converge in the Pacific Northwest, where old-growth logging is destroying ancient redwood groves. Nick and Olivia meet at a protest, embark on a tree-sit in a 1,500-year-old redwood, and become activists. Patricia's research is vindicated by a New York Times feature. Douglas joins the movement. A fire at a logging company's property kills one activist and radicalizes the survivors. Legal consequences begin to fall.

The movement fractures after the fire. Mimi is arrested. Adam studies the psychology of environmental grief and his own complicity. Douglas goes underground. Olivia is killed when a rigging rope fails at a protest. Nick is devastated and begins wandering. Ray has a stroke; Dorothy begins reading to him — including Patricia's book. Neelay's game evolves beyond his control into something that models ecological collapse.

The final movement. Nick has been living in the woods for years, planting trees, off the grid. Adam is imprisoned after being convicted as a co-conspirator in the fire. Mimi serves her sentence and returns to engineering, changed. Patricia retreats to old-growth rainforest and completes her second book — which becomes the basis for a documentary funded by Neelay's company. Douglas dies peacefully in a forest. Dorothy tends the chestnut in the front yard. The novel closes with Patricia in the forest and the quiet suggestion that trees are still communicating, still waiting, still enduring.

Deep focus on Patricia's complete arc: her research into tree communication, the academic ridicule, the near-destruction, the vindication, and her final understanding of what she actually discovered — not just that trees communicate, but that they constitute a form of distributed intelligence operating on timescales that dwarf human civilization.

Neelay's complete arc: the childhood fall from the maple that paralyzes him, his development of Mastery, the game's evolution into something that models real ecological dynamics, and his final project — funding a documentary on Patricia's research that his game's profits make possible.

The quiet emotional spine of the novel: Ray and Dorothy Brinkman meet, marry, and spend decades in conflict over a chestnut tree in their front yard that Ray wants to remove and Dorothy wants to keep. Ray has a stroke. Dorothy begins reading to him — fiction, then nonfiction, eventually Patricia's book on tree communication. The chestnut outlasts their argument. Their attention to it becomes a form of mutual attention to each other.

Adam's psychology research on collective inaction and his eventual imprisonment. Mimi's arrest, trial, and return to ordinary life. Douglas's off-grid years and final peace in the forest. The question each of them faces: knowing what you know, and having done what you did, how do you live in the world that continues anyway?