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"picture book, brother + sister (sister main), dream-like adventures. One scene was the evil lady tempting them with happy stained glass hallway scenes (brother as cowboy on horse, friends/family looking joyful to make them stay and them all just looking thrilled including the sister but she decided to not listen to the lady and instead, try to get her brother out of the “dream” The book was digital on an app I used in school in maybe 2018, 2019"