This is book two in a series that I really enjoy. Read the annotation of the first book, the Alchemyst, and you'll follow the adventures of the brother and sister as they find themselves deeply enmeshed in a world they did not know existed. Their normal lives are now anything but. The author dabbles in the possibilities of grids and powers that suggest another dimension to our world just beyond our perception.
Magician (Secrets of the Immortal Nicholas Flamel, Book 2)