This is the story of a family led to confront a crisis they had never foreseen. Aged eleven, their eldest daughter has stopped eating and speaking. Alongside diagnoses of autism and selective mutism, her parents slowly become aware of another source for her distress: her imperilled future on a rapidly heating planet.

Steered by her determination to understand the truth, the family begins to see the deep connections between their own and the planet's suffering. Against forces that try to silence them, disparaging them for being different, they discover ways to strengthen, heal, and act in the world. And then one day, fifteen-year-old Greta decides to go on strike.