Will Power is the sixth book in the Royal Fireworks philosophy curriculum. It features two kids, Will and Foo, who find themselves in a race against time to stop a man who has developed a frequency that will reveal the human brain to be a machine. In fact, he has already zapped Will, and Will and Foo must stop him before he can broadcast his frequency to the rest of humankind. In the process, they struggle with the question of free will, as discussed by such philosophers as Albert Einstein, Marcus Aurelius, Seneca, Epicurus, Lucretius, and Sartre. They also explore the philosophical skills of making careful observations, defending a position, and tolerating ambiguity.