Deep Blue by Jennifer Donnelly

I loved it! Some of it was a bit hard to understand, but I got used to it. I found it while I was looking for books for fans of The Neptune Project by Polly Holyoke, and it’s truly amazing. Serafina wakes from a nightmare on the day of her arranged marriage. And when Serafina’s mother, Isabella, is attacked, Serafina and her best friend, Neela, must run from Serafina’s kingdom, Miromara. Led only by their dreams, Serafina and Neela will find Ling, Becca, and Ava, and one more, along their journey. To defeat the monster that is stirring, the Six must work together, but one of them is wary, and that hesitation might kill them all. Six heroines, one army, one evil mirror lord, and one monster, which of them will win? I hope you’ll like it!