In this conclusion to the Circle trilogy, Thomas Hunter struggles to stave off a war and a virus that are simultaneously ravaging two worlds' populations. Meanwhile, he must also contend with the ramifications of an incredible love story that unfolds with consequences that are far more crushing than anyone could ever imagine.

This final volume in the Circles series explains how Thomas Hunter first entered the Black Forest and forever changed history as armies were gathered for a final battle in the valley of Midge. The text is both prequel to "Black" and sequel to "White."