Buried secrets. Ancient technology. A race against time.

Deep beneath the ruins of Turkey’s underground city of Derinkuyu, archaeologist David Birch makes a discovery that defies history—a bronze device covered in Greek inscriptions, its mechanisms impossibly advanced for its time. The artifact shouldn’t exist. And yet, its intricate design suggests a terrifying truth: someone in the distant past understood the future.

Desperate for answers, David seeks out Eleni Lillakis, a brilliant historian of ancient technology. As they decipher the artifact’s origins, they stumble upon an astonishing legend—the Michaní Peproménou, the Destiny Machine. A device so powerful it was hidden from the world, tied to the secrets of the gods, and capable of glimpsing what’s to come.

But they are not the only ones searching. A secretive cabal, willing to kill to keep the machine’s secrets buried, is closing in. From the shadowed ruins of Athens to the tunnels beneath Nottingham, from hidden crypts to modern-day power struggles, David and Eleni must unlock the truth before the machine falls into the wrong hands. Because if the legends are true, the artifact does more than reveal the future. It can change it.

A Must-Read for Fans of Archaeological Mysteries and Ancient Secrets

The Cosmos Keys is an electrifying archaeological thriller that blends real historical mysteries with pulse-pounding suspense. Fans of The Da Vinci Code, Indiana Jones, and Steve Berry will be swept away by this globe-spanning adventure, where mythology, science, and danger collide in a battle for humanity’s fate.

⭐️⭐️⭐️⭐️⭐️ What Readers Are Saying:

"A high-stakes thriller with a fascinating mix of archaeology, history, and adventure. Fans of The Da Vinci Codeand Indiana Jones will love this." — NetGalley Review

"A fast-paced, globe-trotting treasure hunt with rich historical details. The concept of an ancient machine predicting disasters is absolutely thrilling!" — Goodreads Review

"Glenn Cooper delivers an immersive, intelligent thriller that blends real artifacts like the Antikythera Mechanism with an action-packed mystery. A must-read!" — NetGalley Review

"The Cosmos Keys vividly portrays the heat of Athens and the chilling underground caves of Turkey. It’s an addictive mix of myth, mystery, and danger." — Goodreads Review

"A cinematic adventure with compelling characters and a gripping pace. The history and mythology are incredibly well-researched and woven into the plot seamlessly." — NetGalley Review