After a violent storm destroys her ship, Isaura Johansdottir knows better than to hope she’ll be rescued from Eisland’s vast Failock Sea. Adrift and alone, her plans to start over lost, it’s a tragic conclusion after the disastrous end of her marriage—until she’s saved by Leonel, one of the merfolk, a creature long believed extinct. In repayment for her life, Leonel enlists her help to investigate the Failock’s mysterious and deadly plague of squalls. But when Isaura discovers Eisland’s ruthless new Lord commands the storms, her life will be in more danger on land than it ever was at sea. As guardian of the Fathoms, Leonel must find the cause of unnatural storms ravaging the tidal currents and destroying the sea life. There are rumors of dark magic stirring in the Orom Abyss, the resting place of old, vanquished gods who tried to submerge the land millennia ago. Yet without proof, no one in King Ægir’s court will listen to him. And if it’s discovered he broke the Blue Laws to save a shipwrecked landweller, he might not survive the consequences. As storms spread, Leonel and Isaura uncover secrets as forbidden as the bond that grows between them. Betrayal lurks in the restless sea, and when ancient powers lay siege to Eisland’s coast, the truth may be drowned along with everything else.

Captured by sirens, Jurek struggles to save his fellow prisoners before they’re devoured. He has little time. His memory is vanishing from his mind, a poisonous effect of the magic that saved his life. With a past steeped in tragedy, it should feel like a blessing. Instead, it's a curse unraveling everything he is. When he strikes a bargain with the sirens – three impossible tasks in exchange for everyone’s freedom – help comes from someone he least expects and whose motives he doesn’t dare trust. Ava, youngest of the billow maidens, has become an unwitting traitor in a war between the gods. Her sisters want her to pledge fealty to the ruinous Eldingar. Her brother, the Guardian of the Fathoms, wants her to act as his spy. And then there's Captain Jurek, a landweller whose fierce heart and haunted blue eyes mean more to her than they should. He doesn't trust her, but without her help he won't survive. As the old gods make their move against the world that betrayed them, Ava must determine whose side she's on. But no matter what she chooses, it'll mean death for someone she loves.