Children have always disappeared under the right conditions - slipping through the shadows under a bed or at the back of a wardrobe, tumbling down rabbit holes and into old wells, and emerging somewhere...else. But magical lands have little need for used-up miracle children. Nancy tumbled once, but now she's back. The things she's experienced...they change a person. The children under Miss West's care understand all too well. And each of them is seeking a way back to their own fantasy world.

Avery is an exceptional child. Everything he does is precise, from the way he washes his face in the morning to the way he completes his homework - without complaint, without fuss, without prompt. Zib is also an exceptional child, because all children are, in their own way. But where everything Avery does and is can be measured, nothing Zib does can possibly be predicted, except for the fact that she can always be relied upon to be unpredictable. They live on the same street. They live in different worlds.

Dreading her first day at a new school, Alex is stunned when she walks through a doorway and finds herself stranded in Medora, a fantasy world full of impossibilities. Desperate to return home, she learns that only Professor Marselle can help her...but he's missing. While waiting for him to reappear, Alex attends Akarnae Academy, Medora's boarding school for teenagers with extraordinary gifts.

The Catenan Republic—the Hierarchy—may rule the world now, but they do not know everything. I tell them my name is Vis Telimus. I tell them I was orphaned after a tragic accident three years ago, and that good fortune alone has led to my acceptance into their most prestigious school. I tell them that once I graduate, I will gladly join the rest of civilized society in allowing my strength, my drive, and my focus—what they call Will—to be leeched away and added to the power of those above me, as millions already do. As all must eventually do.

In a place known as the Ledge, a civilization is trapped by a vast chasm and sheer mountain face. There is no way for anyone to escape the frozen wasteland without befalling a deathly drop. They know nothing of the outside world except that it is where the Glacians reside—mystical and vicious winged creatures who bring meager rations in exchange for a periodic human sacrifice.