Ariane and Wally must find a way to travel to France, and go deep underground, to find the second Shard of Excalibur before Rex Major can get his hands on it. Having saved the first Shard of the sword Excalibur from internet mogul Rex Major (aka Merlin), Ariane and Wally are on the lookout for the second. Wally's worried that the power of the first Shard is already changing Ariane, giving her the strength to do both good and evil and when she seriously hurts his bullying sister Flish, it seems he might be right.