"The Wanderer is weary," was the message that Cara brought to Luster, and what quickly became her mission.

But it is more complicated than simply bringing her grandmother, the Wanderer, back to Luster: the "gates" between Earth and Luster are only open at certain times and only found in particular locations. And haunting nightmares keep slowing Cara down: nightmares of Beloved, enemy of the unicorns; of the father whose legacy she turned against; and of the mother who deserted her.

In order for Cara to complete her mission and accept her destiny it will take not only trust and belief, but the love of a surprising ally as well.