The Warlock (The Secrets of the Immortal Nicholas Flamel #5) by Michael Scott
In the fifth installment of this bestselling series, the twins of prophesy have been divided, and the end is finally beginning.
With Scatty, Joan of Arc, Saint Germain, Palamedes, and Shakespeare all in Danu Talis, Sophie is on her own with the ever-weakening Nicholas and Perenelle Flamel. She must depend on Niten to help her find an immortal to teach her Earth Magic. The surprise is that she will find her teacher in the most ordinary of places.