With extreme effort, Arthur manages to get out of his precarious position using the 'Improbable Stair'. He thinks he's arrived in his bedroom on Earth and he finds his mother in the house, but she cannot see him and he has no way to interact with her. Then a boy comes in, whom Arthur forces to take him out of this copy of his house. The boy then reveals himself to be Sunday in disguise and Arthur is imprisoned. However, he manages to make a toy elephant come to life, which he sends to retrieve his confiscated Keys. When they finally arrive, he is able to free himself. He battles with Sunday, who is also facing the combined forces of Saturday and the 'Piper', an independent powerful House creature. They battle moves to the location of the last part of the Will, which is in the form of an apple tree locked in a golden cage. Arthur's ally the Mariner opens the cage at the cost of his life, and the freed Will fragment traps Sunday while Arthur claims the seventh Key.