The blackout was the beginning. The plague was the plan. This is the endgame.

Six years after a coronal mass ejection silenced the grid, humanity isn't rebuilding. It's losing. The engineered plague that rose from Catalyst's ashes is still doing exactly what its architects designed it to do—evolve. The infected aren't shambling anymore. They're organizing. Hunting with purpose. Converging. And something new has emerged from the horde—something that watches, plans, and waits.

Off the Costa Rican coast, four thousand souls aboard a crippled cruise ship may be one of the last organized remnants of the old world. Supplies are failing. The jungle is turning hostile. And a traumatized boy has begun filling page after page with drawings no one understands—until they're spread across the war room floor and the pattern emerges. It's a map. It's a countdown. And it says the storm is coming for them all.

Deep in the Georgia woods, one man has spent four years alone with what the plague's architect made him. Scott Montgomery loved her. He killed her. And the serum she hid in his blood is still working—making him faster, stronger, and invisible to the infected. She built him for a purpose she never lived to reveal.

Now, as the remnants of mankind face the war Catalyst set in motion years ago, humanity's survival may hinge on its most dangerous question:

What exactly did she build him to do?

Storm Warning is Book 5 in the bestselling Catalyst series—a post-apocalyptic thriller where the end of the world was only the opening move.