For generations, noble polar bears have peacefully ruled the Northern Kingdoms. But a dark shadow is creeping across the snow. A ruthless group of power-hungry bears has seized control, and the once-great society is on the brink of total collapse. Twin cubs First and Second know nothing of this growing danger. First loves to imagine grand stories, while his daring sister, Second, wants to live them. Their innocent world shatters when their mother is suddenly taken prisoner by the new regime. To save her, the young cubs must embark on a terrifying journey across the treacherous, freezing ice. Barely old enough to hunt, First and Second must learn to trust each other and, most importantly, believe in themselves. Their desperate rescue mission will pull them into the heart of an epic battle that will decide the fate of the entire animal kingdom.