In 2010, bestselling author Kathleen Winter took a journey across the storied Northwest Passage, among marine scientists, historians, archaeologists, anthropologists, and curious passengers. From Greenland to Baffin Island and all along the passage, Winter bears witness to the new math of the melting North where polar bears mate with grizzlies, creating a new hybrid species; where the earth is on the cusp of yielding so much buried treasure that five nations stand poised to claim sovereignty of the land; and where the local Inuit population struggles to navigate the tension between taking part in the new global economy and defending their traditional way of life.