When Cassandra had went to the countryside of Jorvik, she finds herself in a new neighborhood and at a new riding summer camp, trying to make new friends. This isn't the first time Cassandra's moved because of her dad's work, but this time their home is permanent. She hadn't been near a horse after her riding accident, but her love for Jorvik and its horses had never wavered. Despite this, it's not long before Cassandra is drawn to the stables. To Rania, Alex, Linda, Lisa, Anne, and to the horses. Especially one horse: Stormflight.
Everything is about to change for Cassandra. Her love for horses is started to grow stronger everyday at the same time that she ends up in the middle of an ancient struggle between good and evil, and the legend of the fifth Soul Rider.