Six days after giving birth, a polar bear named Aurora got up and walked away from her den at the Columbus Zoo, leaving her cub, Nora, to fend for herself. Over the next few weeks, a group of veterinarians and zookeepers worked around the clock to save the cub, a rare opportunity for humans to raise a polar bear by hand. Chronicling this compelling experience, Kale Williams also tells the story of Gene Agnaboogok, a hunter who killed Nora's grandfather three decades ago. As Williams recounts here, Agnaboogok now faces some of the same ecological threats as the wild bears near his Alaskan village, and all of them will need to adapt to survive.