Princess Georgina lives under the crushing tide of Redmere's laws, where being unmasked as a spy means execution. Trapped in a royal engagement, her only escape is by an even more dangerous route: aboard the Crimson Siren with pirate Captain Cinder, a fearsome legend whose past is tangled with Georgina's own.

At sea, freedom tastes like salt and gunpowder. Treacherous storms, whispers of lost treasure, and a vengeful prince pursue them from port to port. But even as love anchors Georgina and Cinder, new threats gather below deck. Old secrets, new foes, and unpaid debts could rip Cinder from Georgina's arms and into the depths for good.

To save their people and each other, they must chart a united course. Because kingdoms rise and ships sink, but a pirate and her princess were never meant to go down without a fight.