Fics like Caldera: The City of Ghosts

Katara strikes a deal with a Spirit to help find out his unfinished business after he saves her from a demon. Easy, right? Only, Zuko isn't sure what his unfinished business is. Zuko's not even sure how he became a spirit. The longer that they get to know each other, the more Katara is uncertain if she can handle finding out.

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