As Rowan pursues a vigilante campaign against corrupt Scythes and Citra takes on her new responsibilities as a junior Scythe, the benevolent AI that governs all of civilization—the Thunderhead—reveals that something has gone deeply wrong within the Scythedom. The second book deepens both the romance between its leads and the philosophical scope of the series, raising the stakes considerably. A strong and emotionally satisfying middle volume.