Yuki Snow wishes she were anywhere but here. She hates Santa Dolores, where her mom and stepdad just moved the family. Her BFF back home, Julio, has already forgotten his promise to stay in touch—and worse, he likes Yuki’s mortal enemy.

At her new school, the kids think she’s either invisible or a know-it-all nerd. The only friend she’s made so far is the shopkeeper at a Japanese antiques store. Among the treasures there is an ancient brass mirror supposedly once owned by celebrated Japanese writer Sei Shonagon. It’s also rumored to be a portal to Shonagon’s world, which opens every hundred years.

So when a woman with long jet-black hair and flowing silk robes appears in the glass, beckoning, Yuki knows there’s only one thing to do—step through to the unknown….