A coded manuscript. A global conspiracy. The search for the Holy Grail begins again.
From internationally bestselling author Glenn Cooper comes a gripping historical thriller that fuses Arthurian legend, medieval secrets, and cutting-edge science in a breathtaking quest for the world’s most elusive relic.

England, fifteenth century.
Imprisoned in a cold stone cell, Sir Thomas Malory—author of Le Morte d’Arthur—believes he has failed in his lifelong search for the Holy Grail. But before his death, he hides the key to its location within the very pages of his famous tale of King Arthur and the Knights of the Round Table.

England, present day.
When scientist and amateur archaeologist Arthur Malory narrowly survives a fire that kills his closest friend and the friend’s wife, he discovers the tragedy may be linked to a long-lost document tied to the Grail. Now targeted by faceless enemies who will stop at nothing, Arthur must follow a centuries-old trail of clues left by his ancestor. His quest will span continents and millennia—from the tombs of Jerusalem to the cathedrals of Spain, from Cornwall’s Arthurian coast to a secret physics lab in France.

But at the heart of this journey lies something even more powerful than the relic itself: a force that challenges the boundaries of science and faith—a force tied to the very origin of the universe.

⭐️⭐️⭐️⭐️⭐️ What Readers are Saying:

“Glenn Cooper never disappoints. The Holy Grail, Gaudí, Malory, Nehor—it’s insane and fascinating. Goodreads Review

“A brilliant fusion of Arthurian legend, science, and spiritual mystery. I fell in love with Cooper’s storytelling all over again.” Goodreads Review

“History, fiction, mystery, and faith—this book has everything. One of Cooper’s best.” Goodreads Review