Centuries ago, the gods of earth and sea went to war and ravaged the worlds of humans. Now, the oceans have swelled and humans have made their homes on floating cities, using precious sea glass as the key to their survival, while Oceanids reign supreme beneath the waves. Vila is one of those humans, fighting every day for control in this brutal world as a Blue Lady and prize fighter. But when a strange corruption seeps through the waters of the Planks, Vila must find allies in an unlikely group to help the people she loves. Narrio is a master thief, making his way on wits, charm and luck; until a secret cult recruits him for a mysterious mission. Now he must travel to the Planks for what may be his most dangerous heist yet to retrieve the ancient object. But he may get more than he bargained for. Something is coming, and it threatens the existence of all. When the moon rises, the seas will change, and nothing will ever be the same. Welcome to the world of the Swell.