Millie is fourteen going on fifteen and loves adventure and action. She loves her family and home life but is tired of the same old routine. Then one day her chance for adventure comes. Her father receives a letter from the Terracustosian army requesting his service in the war against Terracustos's arch enemies...the Tyranites. Millie and her faithful hamster Freddy come up with a plan to take his place in the war.
Soon Millie is on the adventure of a lifetime, making friends, a witty brownie named Little Fur with a passion for sarcasm, and a comical ocean pixie named Humu-Nuku, finding love, exposing traitors, and making a name for herself all while helping her country in possibly one of the most important battles her country has ever been in.
Can Millie find a way to help her country or will she fail in her mission?