The power of Excalibur is changing Ariane in scary ways. As she and Rex Major race for the second shard, Wally's no longer sure whose side he should be on . . . When Ariane seriously hurts Wally's sister, Flish, his belief in her is shaken. Meanwhile, the second shard is in France, and Rex Major already knows it's there. Ariane's powers from the Lady of the Lake enable her to travel magically through freshwater, but now...