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Part 1 of this book covers a lot of what we knew happened to Nero's parents through his stories in the Legion of Angels series. But knowing and reading are two different things. Make sure you have tissues.
Part 2 is more of a continuation from what happens in Legion of Angels book 8 Angels Flight, when Cadence escapes Santuary and rejoins her family on the battlefield.
On another note, Damiel finally gives Cadence he pancake recipe but unfortunately Ella has yet to share what that is with her readers.