Arne did a good deal of thinking as he dragged in branches and twigs. This wasn’t a bit like the Herr Professor who had been so stern and strict and had seemed interested only in lessons. This was really smart—like something Gustav himself might have thought of. He’d like to tell Herr Professor so, but even now he could not quite get up his courage to do that. But when they had collected a large pile of wood and were standing by the fire watching those lights out at sea, he did manage to ask, “Herr Professor, how did you happen to think of doing this?”