Fifteen-year-old half-Inuit Nick and his white brother, Ryan, meet and share an adventure on the Firth River in the Canadian Arctic, facing white water, wild animals, and fierce weather as Ryan documents the effects of climate change on caribou for National Geographic magazine.

Tired of his mother's overprotectiveness and intrigued by the life of African American explorer Matthew Henson, twelve-year-old Alvin travels north and spends a season with a trapper near the Arctic Circle.