Emily and Navin's mother is still in a coma from the arachnopod's<br />poison, and there's only one place to find help: Kanalis, the beautiful<br />city of waterfalls. But when Em, her brother, and Miskit<br />and the rest of the robotic crew aboard the walking house reach the<br />city, they quickly realize that seeking help is looking for trouble,<br />dangerous trouble.