I saw the cover and was immediately was like “this has to be Zutara/Phantom of the Opera crossover fanfiction” and I was here for it (though I don’t particularly love about either of those ships).
It delivers on the Phantom stuff. Not so much the Zutara stuff (though the descriptions of the characters are spot on Zuko and Katara).
I was hoping since it was a physical book the writing wouldn’t be terrible. For better or worse it ended up being about as good as typical fan fiction. E.g., lots of flowery descriptions and not a ton of character development. There was also a really weird mixture of modern language and trying to sound old fashioned - like when all the characters say “nay” instead of “no” after a normal sounding sentence. But plenty of descriptions of angels of music, magical singing, and haunted towers. I guess I got exactly what I signed up for! Still I do wish the book expanded on the world a bit more - not enough of the magic is explained - but it was a fun quick read.