In 2020, writer and campaigner Guy Shrubsole moved from London to Devon. As he explored the wooded valleys, rivers and tors of Dartmoor, Guy discovered a spectacular habitat that he had never encountered before: temperate rainforest. Entranced, he would spend the coming months investigating the history, ecology and distribution of rainforests across England, Wales and Scotland. Britain, Guy discovered, was once a rainforest nation. This is the story of a unique habitat that has been so ravaged, most people today don't realise it exists. Temperate rainforest may once have covered up to one-fifth of Britain and played host to a dazzling variety of luminous life-forms, inspiring Celtic druids, Welsh wizards, Romantic poets, and Arthur Conan Doyle's most loved creations. Though only fragments now remain, they form a rare and internationally important habitat, home to lush ferns and beardy lichens, pine martens and pied flycatchers. But why are even environmentalists unaware of their existence? A rich, elegiac and boundary-pushing feat of research and reportage, this is the extraordinary tale of one person's quest to find Britain's lost rainforests, and bring them back.