The Arctic is not empty. It has never been empty. When a Russian bioweapon escapes containment on the ice of the Laptev Sea, Dr. Eira Skeldsen breaks every rule she has followed for nearly two centuries. She saves a dying man — using knowledge no human doctor should possess. Because Eira is not human. Born beneath the glaciers of Iceland, she is Thrymsan — part of an ancient civilization hidden in the polar ice for over 127,000 years. For generations, her people have observed humanity from the shadows, asking a single question: Can they be trusted? When Thrymsa reveals itself to the world — a dome of impossible ice rising from the Arctic — Eira is forced into the role of liaison between two species that have shared a planet without knowing it. As governments scramble for control, and as her connection to American diplomat Daniel Cross deepens, Eira must navigate a fragile peace between civilizations that measure time very differently. But when human urgency collides with Thrymsan patience, she will face a choice no amount of training prepared her for — between the civilization that made her and the one she has spent centuries learning to love. THRYMSA is a first-contact thriller about trust, sovereignty, and what it means to belong to two worlds when both are watching to see which one you choose.