Tucked deep in the woods and surrounded by a great iron fence lies Brassmere Academy for the Extraordinary, a school for orphans with strange and wonderful gifts.

From bending metal to charming animals, extraordinary is ordinary for the children of Brassmere. Twelve-year-old Plum has lived there for as long as she can remember.

Each night, she ventures into her dreams alongside her three best friends, Vien, Gwendle, and Artem to fight monsters and journey on dangerous quests. But one night, Plum gets a mysterious warning that none of her friends remember upon waking. And the next morning, Artem is nowhere to be found.

As Plum, Vien, and Gwendle search for their friend--in both the dreaming and waking worlds--they start to uncover alarming secrets about Brassmere and its intentions. Will they be able to find Artem before it's too late, or will they be next to disappear?