On turbulent seas of the Napoleonic Wars, Ella Parker dedicates herself to healing the sick and wounded, resolutely dismissing the idea of romantic entanglements. Her commitment is tested when her childhood friend, Jamie Flowers, is captured by the enemy and imprisoned in a French fortress, along with other sailors for whom she deeply cares for.

When Ella is presented with a chance to travel to the prison, her mission is twofold: to rescue her friends and to complete a covert assignment. As she embarks on this perilous task, she must navigate a labyrinth of treacherous alliances, fend off bandits, and outwit a cunning prison commander.

As Ella's journey unfolds, she uncovers a sinister secret. But is she too late? Despite Ella's burgeoning affections for Jamie, she’s unaware of his possible heart condition that may cut his life short. With time running out, Ella must confront her deepest fears.