A lost notebook of the legendary alchemist John Dee surfaces at a London auction, where a scandal-ridden billionaire snaps it up.

A financier with a fascination for the occult, Marc Pearson believes the notebook contains the location of the Devil's Eye, a mystical stone promising to unlock the cosmic knowledge of God. In the hands of the world's foremost blackmailer, it would mean total power.

CIA operatives Ridley Samaras and Booker Douglas decipher John Dee's encryption within the pages of the notebook, plunging into a high-stakes hunt across Europe to find the missing artifact before Pearson does. From the snowy streets of Edinburgh to the canals of Venice, from the heart of London to the grand palaces of Vienna, they find themselves locked in a blistering race with Pearson's deadly team of mercenaries.

As Ridley and Booker close in on their target, they could never have imagined the reach of the billionaire's influence, as their pursuit leads them to the very threshold of British royalty. There, they must decide how far they're willing to go to stop Pearson before he unlocks a terrible power.