The trilogy revolves around Tanaquil, a young woman who is better at tinkering than magic, much to the dismay of her sorceress mother.

This unicorn, which once was of radiant mother of pearl hue, became of this world through majestic being and wondrous magnificence.

On the way she discovers a vast army led by an empress - Lizra, Tanaquil's half-sister.

Tanaquil finally returns to her mother's fortress in the desert, but only disappointment and heart-ache await her.

As she contemplates leaving once again when a red unicorn appears, and she follows it into a mirror where she finds a world that exact opposite of her own, complete with a version of herself named Tanakil.