James Bell's breakthrough was meant to heal. Coerced by a man who answers to no one, his regenerative science is folded into a wearable device that fourteen billion people already trust with their lives — and turned toward something it was never intended to do.

What Volkov builds from it is not a weapon in any shape the world would recognize. It is engineered to obey, and it does not stop. As the line between healing and harm collapses, Bell is left to reckon with what his life's work has become, and how far one man will go to take it back.