The magician - Michael Scott

California:

In the hands of Dr. John Dee and the Dark Elders, the book of Abraham the Mage could mean the destruction of the world as we know it. The most powerful book of all time, it holds the secret to eternal life. A secret more dangerous than any one man should ever hold. And Dee is two pages away from the knowledge that would bring the Dark Elders into ultimate power.

His only obstacle? Josh and Sophie Newman - who are 8,000 miles away.

Paris:

After fleeing Ojai, Nicholas, Sophie, Josh, and Scatty emerge in Paris. The City of Lights. Home for Nicholas Flamel. Only this homecoming is anything but sweet. Perenell is still locked up back in Alcatraz and Paris is burning - with it, the last hopes for the human race. Nicollo Machiavelli, immortal author and celebrated art collector, is working for Dee. He's after them, and time is running out for Nicholas and Perenell. Every day spent without the book they age one year - their magic becomes weaker and their bodies, more frail. For Flamel the Prophesy is becoming more and more clear. It's time for Sophie to learn the second elemental magic. Fire Magic. And there's only one man who can teach it to her. Flamel's old student The Comte de Saint Germain--alchemist, magician, and rock star.

Josh and Sophie Newman are the world's only hope. If they don't turn on each other first.