Mahurin uses a two-trajectory structure, giving both Lou and Reid separate narrative and character arcs. How does flipping between their viewpoints enhance the novel’s themes?

Jean Luc clearly envies the Archbishop’s favoring of Reid. How does Jean Luc’s characterization show that envy is determinantal to friendship?

For any witch to use magic, she must sacrifice something in return. Why does Mahurin add this condition to performing magic? How does it serve her plot or add to the tension?