Naira Creswick sets out to fight the demons that stalk her. With Gemini and the other kids living in an abandoned factory, she learns what makes these demons tick. When her brother Ed returns from Iraq, the ancient tablet he brings draws her into a world that is awakening from a two-thousand-year-long sleep. Naira knows this tablet holds the key to destroying the demons--if she can learn its language and master its mathematical magic. She must hurry: disasters strike and the demons grow stronger. Naira has to use all her wit and imagination to hold her troubled family together as she unlocks the Tablet of Heavenly Secrets.