A new stone has awakened in Iceland, and its power will reshape the world.
When Swedish researcher Lorelei Decklund discovers a crystal chamber hidden behind the Sk gafoss waterfall, she is transformed by the Earth-aligned Dreamslinger Stone inside. It grants her control over the ground beneath her feet-an extraordinary power that puts her on a collision course with those hunting the relics.
Her husband, Johan, is not as fortunate. Captured in Europe and lost in the chaos, he later encounters a second Dreamslinger Stone, this one aligned with water. His brief connection to it sets off a chain of events neither he nor Lorelei could have foreseen.
Across the world, Rupert Kline continues his relentless rise to power. Now empowered by multiple stones, including the Strength Stone and the Stone of Control, he expands his influence with terrifying speed.
Meanwhile, Alex McCray is struggling with the consequences of the stones he carries. His healing stone keeps him alive; the fire stone he recovered from Collier is both a weapon and a curse. Alongside Emily, Scott, and Christina, Alex chases the truth behind the stones and the mysterious civilization that left them behind. Their only clue comes from Siobhan's story-an unconfirmed warning about a distant star on the brink of a catastrophic gamma-ray burst, and a test left for humanity long before it existed.
As new alliances form and old ones fracture, the stones begin drawing their wielders toward one another. Lorelei's desperate search for her husband, Kline's violent ambition, and Alex's struggle to stay human collide in a global crisis that pushes every character to their breaking point.
Petrichor is the pivotal third book in The Twelve Stones saga-an international thriller of discovery, loss, and the first true glimpse of the stones' ancient purpose.