In a realm where the great houses rule separate kingdoms—trade, knowledge, resources, craft, and war—the balance of the land depends on cooperation between rival heirs. y/n, a gifted traveling physician from a humble farming kingdom, moves between their courts treating illness and injury. As she becomes entangled with princes, scholars, warriors, and inventors, she finds herself at the center of rivalries, alliances, and secrets that could shift the balance of the entire realm