A buried relic. An angelic language. A choice between heaven and hell.

When archaeologist Hiram Donovan smuggles a polished disc of black obsidian out of an Iraqi monastery, he’s murdered—and the secret of the “showstone” vanishes with him.

Thirty years later, Harvard religion professor Cal Donovan learns the truth about his father’s death and discovers the stone is real, coveted by believers and fanatics who think it can unlock a lost “49th call” in the angelic Enochian language. Some see a key to paradise. Others, a gateway to something far darker.

From Elizabethan magus John Dee’s notebooks to modern‑day scryers and ruthless enemies, Cal is thrust into a race to find the showstone before it’s used to unleash catastrophe. Expose the secret, and risk the end of everything—or bury it forever.

The Showstone is a fast‑paced religious and historical thriller for fans of Dan Brown and James Rollins.