Growing up in Skyros, Opaline has always felt like the odd one out. Though she is an alicorn, she is ostracized by the only two other alicorns she knows: Celestia and Luna. Still grieving over the recent loss of her parents and desperate for acceptance and friendship, Opaline tries to win the approval of the princesses, who only turn up their noses at her.

Soon, the innocence in Opaline’s heart gives way to a darkness that will change everything.