When Enna's brother, Leifer, brings home a mysterious piece of vellum that teaches him how to set fires - without a spark, without a flint - Enna cannot decide if this power is one she wants for herself, or something that should be extenguished for ever. But then war threatens Bayern, their country, and the choice becomes even more unbearable. Enna never imagined her control over the warm live-giving energy of fire could become something so destructive, but it is starting to consume her and everything she loves.