Well, it could suggest a dramatic transformation or a cleansing of some sort. Maybe it's a symbol of a new beginning emerging from the ashes of the fire-enveloped story.
It might imply danger and chaos. Fire usually brings destruction and uncertainty.
It could potentially mean that the characters are facing extreme challenges or that there's a hidden truth being obscured by the flames. Maybe it's a metaphor for the passions and conflicts burning within the story's world.