"Well," said Christian, "what shall we do now?"

"Our task is simple," answered Paul. "To bring back the Brains who are now in your time and then to destroy the time machine."

He turned to Barbara.

"I am afraid you must remain here, my dear," he said. "One of us must be here to guard the machine."

Barbara nodded.

Paul took a crystal out of the machine and fastened it to his belt. Then he took another crystal and fastened it to Christian's belt.

Barbara held out her hand.

"I don't think we shall meet again, Captain," she said, "so I wish you good luck" To Paul she said: "Take care of yourself."

Paul took a small metal box. Then he touched the crystals on his and Christian's belts. There was darkness again. Christian wondered what was waiting for him in his own time.

Christian and Paul were sitting at the table in front of the Old Man, head of Military Intelligence.

"Glad to see you, Captain," said the Old Man. "And your friends. I hope you have brought good news. Cigar?"

"Thanks." Christian took a cigar from the wooden box and lighted it. "This is one thing they haven't got in the future," he said with pleasure.

The Old Man was looking at Paul.

"So you are a man from the future?

"One hundred thousand years in the future," said Paul.

Christian told his story. The Old Man listened attentively and did not interrupt him.

You've done well, Captain," he said when Christian finished. "At least we know now who are our enemies." He turned to Paul. "Do you think you cap help us?"

Paul nodded.

"I think so," he said. "It won't be easy, but I think I can do something."

"Good," said the Old Man. "We will give you any help you need. Our situation is desperate," he continued. "We cannot do anything with the Brains because they disappear immediately. And appear in other places, destroy, kill, and disappear again. I have here - " he lifted some papers from the table, "details of murders in all parts of the world - Cuba, Turkey, Russia, other countries. And all the victims were scientists. All our rocket bases have been destroyed. It is clear that they want to stop us from getting into space."

"It will all be different now," said Christian.

"I hope so," said the Old Man. "By the way," he continued, "I have let your friend Fox know that you have come back. He wants to see you. I think he has a surprise for you -"

Christian smiled.

"And I have a surprise for him - Paul"

The Old Man said: "It will be better if Mr. Paul stays with us."

Paul stood up

"I am going with Captain Christian," he said

The Old Man opened his mouth to speak - and changed his mind.

Christian and Paul came to Doctor Fox's house in a taxi. The door opened, and Doctor Fox jumped out and shook Christian's hand.

"Chris! It's good to see you again... come in, come in!"

He ran along the corridor. At the door of the living room he stopped.

"Surprise!" he shouted.

Christian saw a small figure with dark hair.

"Why, Jo!" he exclaimed.

"Mrs. Fox," the doctor said proudly. "We have been married a whole week."

Christian laughed.

"Well, congratulations!"

"Welcome back, Sailor," said Jo.

"This is Paul," said Christian "Paul, these are two good friends of mine."

Paul stepped forward, smiling.

Fox and Jo were listening with great interest while Christian was telling them about his adventures.

"The Brains will find you," said Paul to Christian when they left Fox's house. "You have interfered with their plans too often, and they will not forgive you that. They will come to you soon, I am sure. And when they come, I want to talk to them."

They drove to Reading, where the captain's yacht was still standing in the quiet place in the Thames.

In the cabin of the yacht Paul put his metal box on the table and opened it.

"You need not be afraid, Captain," he said. "My energy barrier will protect you."

Christian pulled out a box of shells and loaded his automatic.

"If the Brains come," he said, "let them be afraid."

Paul looked at him.

"There will be no more shooting, please," he said. "I don't want any more killing."