Two pirate captains. One wish. Countless secrets. Salt water may be thicker than blood, but how many secrets can a friendship survive? Forced into servitude by pirates, Vaan and Sirene survive two years beneath their tyranny before seizing their chance for vengeance and freedom. Fifteen years later, closer than sisters and pirates themselves, they serve as dual captains aboard the Kingfisher. When Sirene learns of an enslaved siren said to grant her savior a single wish, she sees a chance to give children born as she was the future she never had. But the hunt grows complicated when an old debt forces Vaan to welcome two new—and begrudgingly handsome—recruits aboard. Worse, a ruthless Navy admiral from her past is searching for the same prize. With Sirene determined to reach the siren first, Vaan is forced into impossible choices to keep her alive. And the more she hides, the more she risks destroying the bond she’s desperate to protect. With powerful enemies closing in and a wish worth killing for almost within reach, Vaan and Sirene must discover how far they’re willing to go for each other—and how much a wish is truly worth.