Nightfall question

The theme of "Nightfall" is working together and staying together. You can see this theme throughout the book because they all have to work together to clean the house and make it the way it's supposed to be. They also have to stay together on the journey to the desert lands so they don't get lost. You can see this theme developing over the course of the book because when the boats come to take them off the island, Line goes missing and they all have to work together to find him.