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Mermaids have been sinking ships and drowning humans for centuries, and now the government is determined to put an end to the mermaid problem—by slaughtering all of them. Luce, a mermaid with exceptionally threatening abilities, becomes their number-one target, hunted as she flees down the coast toward San Francisco. There she finds hundreds of mermaids living in exile under the docks of the bay. These are the Twice Lost: once-human girls lost first when a trauma turned them into mermaids, and lost a second time when they broke mermaid law and were rejected by their tribes. Luce is stunned when they elect her as their leader. But she won't be their queen. She'll be their general. And they will become the Twice Lost Army—because this is war.

After parting ways with her troubled mermaid tribe, Luce just wants to live peacefully on her own. But her tranquility doesn't last long: she receives news that the tribe is on the verge of collapse and desperately needs her leadership. The tribe's cruel queen wants Luce dead. Dorian, the boy Luce broke mermaid law to save, is determined to make her pay for her part in the murder of his family. And while the mermaids cling to the idea that humans never suspect their existence, there are suddenly ominous signs to the contrary. But when Luce and Dorian meet, they start to wonder if love can overpower the hatred they know they should feel for each other. Can Luce fulfill her rightful role as queen of the mermaids without sacrificing her forbidden romance with Dorian?