Strange forces are at work in the frozen north. Princess Flurry Heart has been afflicted with unnatural nightmares, and the sorcery that has precipitated them is still a mystery. Luckily, a temporary cure has been found in a potion brewed by the Princess's crystaller, Sunburst. As the newly appointed Court Wizard of The Crystal Empire, the foal's night terrors only compound his problems--especially when he has to prepare a new batch before dusk.