“Then I have one question,” Clive said. “And what’s that?” Boris asked. Clive stormed over to the diagram and jabbed his finger again at the offending variable. “WHAT IS THIS?” he yelled. “You clearly understand this magic. You probably understood it before any civilisation I’ve heard of existed! What is it?” Boris burst out laughing. “It’s time,” he said. “Time?” Clive said. “That doesn’t make sense.”

