Mera, the queen of Atlantis, mysteriously disappears, and Aquaman begins searching high and low to find her. In addition, Atlantis is in the grip of a new enemy named Narkran, a duplicitous politician with plans to rule the underwater kingdom with an iron fist. And finally, as if that isn't bad enough, Black Manta shows up to take advantage of Aquaman's desperate situation.
Terrorists and crime lords have taken over the watery kingdom of Atlantis, but a rebel alliance is forming in the darkened corners of the city. Arthur Curry, along with a mysterious and powerful young woman named Dolphin, quickly becomes central to intrigues that forebode an Atlantean civil war. When rumors of Aquaman's activities reach land, the recently exiled Mera vows to join him in his quest to restore sanity to the sprawling domain of Atlantis.
When the king of Atlantis dies, the citizens look to their former ruler Aquaman for leadership. But the undersea civilization that he and Dolphin return to is falling apart. The people are fleeing the capital city of Poseidonis as mysterious forces lift it ever closer to the surface. Aquaman must undo the damage or else the environmental impact of the rising city could be catastrophic--not only for Atlantis, but for the surface world as well!