What happens to the human soul when it is shared with machines
Is it possible for a person to loose their soul, and can a machine gain one.
How does power corrupt the soul
redemption. Each character has done wrong and is trying to do right.
Finding hope in a dying world.
A good death. Lewis’ motivation for killing Tracy is partly to give his wife a sense of purpose and hope before they die. Katy gives Nigel a good death by allowing him to reminisce on their past before she shoots him. Katy also comforts Tracy as she dies. Katy and Lewis choose to end the world, thus ensuring the death of their daughter, rather than allow it implode into them.