Another year at Kadic, another year trying not to get killed by XANA. The Lyoko Warriors aren't out of danger, but they do have something new. Someone. Ulrich's cousin, Katherine Stern transfers to Kadic, but she isn't safe. To keep her from danger, she joins them in their mission to destroy XANA. On the way, secrets are revealed, a new danger arises and romance brews. Join them.