Paul appeared beside him.
"All the Brains are in their time," he said. "Now the only thing I have to do is to destroy their time machine. I shall do it at once. So - I must say good-bye, Captain"
Christian took the crystal off his belt and gave it to Paul. He felt that he must make a speech, but could not find words.
"Thanks," he said. "Thank you for all you have done - from all the people of Earth."
They shook hands.
"Now you can be sure of your future," said Paul. "So - good-bye and good luck to you."
He touched his crystal and disappeared.
Christian stood a long time, looking down at the Thames and his yacht. The adventure was over. At last people could breathe a sigh of relief. He felt good. He thought about his friends - Doctor Fox and Jo, who were waiting for him.
He turned and walked away.