In Like Flynn by Lauren Smith

Brianna Holland has always been free. Her entire life she’s never known the bars of any cage until she’s captured in Port Royal trying to help a fellow pirate escape. Suddenly facing the hangman’s noose unless she betrays her father’s location to the Royal Navy, she clings to the hope that a new prisoner in her cell brings. The roguish and seductive Nicholas Flynn is charming and irresistible and soon the pair make a clever escape from the prison. Once on board her ship and safely at sea, Brianna soon learns that there are other dangers than storms and naval frigates prowling the waters. This time, her heart and her father’s life might be at risk.

Royal Navy Lieutenant Nicholas Flynn has a problem. He’s been assigned to gain the confidence of a pirate prisoner in Port Royal in order to learn the whereabouts of the notorious pirate king Thomas Buck. But when he meets the man he’s supposed to win the trust of and eventually betray, he is stunned to discover it’s no man, but a woman named Brianna, who he is to befriend and betray. Not only that, but he learns that she is Thomas Buck’s daughter. Knowing Brianna will face torture at the hands of a cruel military captain if she doesn’t talk, Flynn helps her escape. If Flynn finds a way to lead the Royal Navy to Brianna’s father, he’ll lose the only woman who’s ever stolen his heart.