Bereft of leadership after a critical ritual goes fatally wrong, stalwart remnants of the Mundani Palinjian cult vow vengeance. They blame the Melfar and their Mundani sympathizers, attacking randomly and with escalating brutality. Melfar and their allies look to Meridia, the mixed-race healer who brought them the miraculous Song of All Songs straight from the wisdom of the Migrant. They'd hoped the Song could heal the age-old afflictions of hatred and distrust, but clearly something more is needed.
Traveling with the Migrant deep into the past, Meridia witnesses the apocalyptic origins of Earth's two peoples. Inspired by their struggles, she determines to help craft a new narrative, a story that can show Melfar and Mundani who they are, how they came to be, and bring them together at last. They'll call it the Book of All Time.
Back in her own time, Meridia learns of a plot that could revitalize the Palinjians, even as a deadly epidemic resurges. Both Melfar and Mundani are calling Meridia a Prophet, but can she become what they need? Can she save them from one another?