<b >A ten-year-old is tasked with saving the world from destruction in this fantastical, mathematical adventure—now in paperback!</b><P>Ten-year-old Flor Bernoulli loves to buy delicious spiral pies each week from the owner of the Sky High Pie Shop. But in addition to making pies, the eccentric and charming Dr. Pi is also one of the guardians of the universe who must keep the fire of life burning. Without him, the natural marvels that contain spirals—such as seashells, sunflowers, and hurricanes— <P>would cease to exist. <P>Then Dr. Pi discovers that two mysterious men, Mr. It and Mr. Bit, are hot on his trail and determined to take the fire for themselves. Can Flor help save the universe…or will she be too late?