Two years ago, the ash started falling like gray snow. The volcanoes had erupted. . . . For Miles and his sister, Sarah, the real disaster started in the violent aftermath-when they were forced to leave their cushy suburban home and flee to the north woods for safety. Miles got them to a cabin, but now winter is setting in. All they have to get them through is the milk from Sarah's prized possession-her goat-and Miles's memory of wilderness survival skills.When Sarah tries to regain some normalcy by attending the local school, she realizes she is no longer quite the person she used to be. Now she is Goat Girl, a Traveler, and it's hard to pretend she isn't. And when a horrific twist of fate robs Miles of his memory, he discovers the heart of his true identity. They knew the volcanoes would change the world. Now, in order to survive, they must change with it.