While armies of the Shadowrealms gather and Machiavelli goes to Alcatraz to kill Perenelle Flamel, fifteen-year-old twins Sophie and Josh Newman accompany the Alchemist to England to seek Gilgamesh.

Fifteen-year-old Josh has chosen to side neither with his twin sister Sophie nor with the Alchemyst, Nicholas Flamel, but rather to fight alongside Dr. John Dee and the mysterious Virginia Dare, while the immortal Machiavelli and Billy the Kid follow the Elders' plans to set loose the monsters of Alcatraz on San Francisco and trigger the end of the humani race.

It's the debate of the ages; this time, held in a seemingly insignificant venue, but the outcome, as always, will be life-changing. A Christian college freshman, Josh Wheaton, and his atheist philosophy professor hold court on the existence of God. To pass the course, Josh must prove to the class that God is alive and well. This dare could cost him his relationships, his career, even his future, but Josh stands up for his faith and takes on the challenge....