In the sequel to The Lieutenant, Tempest Shadow goes back to her home town along with Twilight and Celestia. But while on their incredible journey, they come across dark forces outside of Equestria.
Tempest Shadow has an untold past that nopony really understands. One day, she tells Twilight Sparkle what actually happened on the day she lost her horn and also learns a valuable lesson; that everypony is truly wonderful in their own way...
Their past is a mystery. They live in the underwater world of Seaquestria. But waiting up on land, up in Equestria, are not only their families, but also new adventures and possibly, love. However, they must keep their past watery life a secret.