The ancient forests of the Pacific Northwest are home to giant old-growth trees, and many secrets, which science is just beginning to understand. These forests are our best climate change allies, storing huge amounts of carbon and retaining water, protecting communities from droughts, floods, and wildfires. But these forests are at risk of disappearing. In British Columbia on First Nations territory, a small band of forest defenders are risking life and liberty to protect some of the last remaining ancient forests.