Few animals on the planet inspire the sense of wonder evoked by the narwhal. The ‘Arctic unicorn’ is everyone’s version of “awesome” and “cool.” Explorers, aristocrats, artists and scientists celebrate this elusive whale and its extraordinary tusk. From Flemish unicorn tapestries, Inuit legends and traditional knowledge, and the research of devoted scientists, comes a tale of discovery reported here from the top of the world, a place where climate change is rapidly transforming one of the harshest environments on earth. How did the narwhal tusk become the horn of the fabled unicorn? What treasures do the Inuit hold about this majestic but elusive denizen? What have scientists discovered about the function of its tusk? Explore with whale biologists as they capture live narwhals to answer questions of narwhal biology, migration, population and behavior. Ponder the evolutionary history of the narwhal through paleontology and genetic science. Contemplate the fate of northern regions, animals, and peoples in a rapidly warming Arctic. Experience the insights and observations of Inuit hunters who have lived with the narwhal for thousands of years. The following pages present their views along with the latest research in narwhal biology, art, and climate science illustrated by more than a dozen photographers and graphic artists.