"Are there any Nazis left that I could hunt down and bring to justice?" Augustus asked while we leaned over the vitrines reading Otto's letters and the gutting replies that no, no one had seen his children after the liberation. "I think they're all dead. But it's not like the Nazis had a monopoly on evil." "True," he said. "That's what we should do, Hazel Grace: We should team up and be this disabled vigilante duo roaring through the world, righting wrongs, defending the weak, protecting the endangered." Although it was his dream and not mine, I indulged it. He'd indulged mine, after all. "Our fearlessness shall be our secret weapon," I said. "The tales of our exploits will survive as long as the human voice itself," he said. "And even after that, when the robots recall the human absurdities of sacrifice and compassion, they will remember us." "They will robot-laugh at our courageous folly," he said. "But something in their iron robot hearts will yearn to have lived and died as we did: on the hero's errand."