I accidentally read this book before its prequel because I didn't notice in the Libby app that it was part of a series! Oh well, it stood alone well enough. In the first book, the main character, Zinnia, discovered an ability to slip out of our real world (where she has a genetic condition which will probably kill her by her mid-twenties) into the alternate universes of fairytales. She has made a business of rescuing princesses from their own stories and helping them find truer happy endings. But when she is pulled through a mirror not by the needs of a protagonist but under the power of a wicked queen, Zinnia has to face some harsh realities. The evil queen claims she wants to leave her tale and live- which is exactly what Zinnia is doing, and it seems to be weakening the walls between universes. Also, Zinnia has been avoiding calling home for months, unwilling to face a conversation with her best friend and family about her health. Then she lands in the darkest and bloodiest story she's experienced yet- only to find she has allies in unexpected places. Very queer, very meta. I often avoid fairytale retellings but this one brought some nice originality to the genre. Probably would have been a solid 4 out of 5 or higher if I hadn't read it out of order.