As the burning city of Acre falls from the hands of the West in 1291, a young Templar knight, his mentor, and a handful of others escape to the sea carrying a mysterious chest. In present day Manhattan, four masked horsemen dressed as Templar Knights steal a strange device. In the aftermath, an FBI investigation is led by anti-terrorist specialist Sean Reilly. Soon, he and archaeologist Tess Chaykin are drawn into the dark, hidden history of the crusading knights.

In the powerful new thriller from the author of the international bestseller The Last Templar, a geneticist and a CIA agent on a deadly quest to find the most dangerous book in the world discover a secret that has destroyed everyone in its path for centuries.

Istanbul, 1683: Mehmed IV, sultan of the Ottoman Empire, is preparing to lay siege to Vienna, capital of the Holy Roman Empire, when a mysterious visitor arrives in his bedroom - naked, covered in strange tattoos - to deliver a dangerous, world-changing message. Paris, 2017: Ottoman flags have been flying over the great city for 300 years, ever since its fall - along with all of Europe - to the empire’s all-conquering army. Notre Dame has been renamed the Fatih Mosque. Public spaces are segregated by gender.

When the National Security Agency’s invincible code-breaking machine encounters a mysterious code it cannot break, the agency calls its head cryptographer, Susan Fletcher, a brilliant, beautiful mathematician. What she uncovers sends shock waves through the corridors of power. The NSA is being held hostage…not by guns or bombs but by a code so complex that if released would cripple U.S. intelligence. Caught in an accelerating tempest of secrecy and lies, Fletcher battles to save the agency she believes in.

In Antarctica, a scientific expedition drops anchor for a live news feed. As the CNN journalist begins her report, a massive, shimmering sphere of light suddenly appears in the sky, enveloping the ship in luminous white light before disappearing as mysteriously as it arrived - the entire event witnessed by an incredulous world audience.