If Emma keeps the book, then she bound to stumble across pictures of Charming and Snow and Regina. They are in there. We’ve seen them. They are often used as transitional pieces to get us into FTL from SB via Henry’s POV. Maybe that will lead her to accepting the truth of FTL. And then, and only then, can she start to really break the curse.
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"He was a lot of things to me" "The only conclusion was love"