Kem Luther's "Boundary Layer" is nothing less than a gorgeous journey through the forest ecosystem layer of ferns, mosses, lichens and fungi. But it is even more than that. Luther explores the work of scientists working in the Pacific Northwest, whose work and lives are helping to enrich and navigate our understanding of the natural world. And his journey back through time, using the work of Von Humboldt and Leopold, amongst others, gives a vertiginous and spellbinding sense of history to our relation to West Coast ecosystems. From Trevor Goward's work on Lichens, in Northern BC, to Adolf and Oluna Ceska's work discovering new species of mushroom in the Saanich Peninsula, Vancouver Island, Luther weaves together an opus of beauty. His is a book a long time coming: readable, exciting, attentive and endlessly knowledgable. It will be as useful to scientists in the field as it will be to those who wish only to learn more about this rich and diverse region.