SANDRY'S BOOK isn't just a story about young thread-mage-in-training Sandrilene fa Toren. It's about her as well as her foster siblings - Daja (metals), Briar (plants), and Tris (weather) - as they come to the Winding Circle Temple to learn how to use their unique powers. All of them are outcasts in some way; and while they struggle to fit in and stay out of trouble at Winding Circle, they manage to find common ground together. But when disaster threatens their new home, the quartet must find a way to save themselves and the only place where they feel like they belong.
To be honest, I struggled with the first half of SANDRY'S BOOK. It was mostly due to the POV characters. Daja was the only one I connected with for a while because of her maturity, solemnity, and loyalty to everyone she cares about. But Tris and Briar were difficult to like early on, and Sandry seemed... too naive? Too childish? I think I was under the impression that SANDRY'S BOOK was YA, so I didn't realize until later that the book length, writing style, and character's ages make it more of a borderline Middle Grade / YA. Also, once all four students have arrived at Winding Circle, there's quite a bit of "head-hopping" from one POV character to another during the same scene. Some readers don't mind it, but personally I prefer to stay in one character's head at a time.
Eventually SANDRY'S BOOK grew on me, though. Once Sandry and her new foster siblings warm up to each other, they accept one another's differences and become curious about each other's talents and pre-Circle lives. The worldbuilding is interesting, too, with its many ethnicities / cultures, craft and element based magic system, and a brewing conflict between old-world ways and technological advances (greenhouses, irrigation systems, etc.). There are shades of Mediterranean, Middle Eastern, and Indian influences here; I admit I geeked out a bit about meditation as a calming force for mages. And I was pleasantly surprised by the amount of character diversity (examples: Daja is dark-skinned, Briar is brown-skinned and biracial, and Tris wear glasses and views herself as chubby).
In the end, though, SANDRY'S BOOK was just OK. It's a quick, entertaining read about new friendships, magic, and belonging, with that familiar "coming of age" theme that naturally comes with characters discovering their unique abilities. A lot of readers seem to love this story, but to me it wasn't as memorable as Pierce's Tortall books. (Which reminds me: I need to finish that series this year!) But I'm curious to see how Sandry and her friends grow up with each other and into their powers, so I'll definitely continue the Circle of Magic series.