From Mexico to the Arctic ice, grey whale mothers swim with their calves. Following them, by bus, train and ferry, are Doreen and her toddler Max, in pursuit of a wild hope. Doreen first visited Alaska as a young journalist reporting on climate change among indigenous whaling communities. There, drawn deeply into an Iñupiaq family, she joined the bowhead whale hunt, watching for polar bears under the never-ending light. Years later, now a single mother living in a hostel, Doreen embarks on this extraordinary journey: following the grey whale migration back to the Arctic, where greys and bowheads meet at the melting apex of our planet.