I am shit at coming up with titles. Always have been, always will be. It's hard to come with that one essential slogan that encompasses your entire story and it was even harder when I didn't have an entire book to name.
I was calling the book The Barbadian Bride for a minute because Madeline, the heroine, is from Barbados and a lot of her inner conflict stems from her childhood there (more free, but also with her mother dying and plantations full of slaves) and her life since living in England. And, at the end, she becomes a bride. It's a play on Mary Jo Putney's The Bartered Bride.
But I'm not sure that it really fits the story as it is now.
I could call it something generic like Smashing the Rules (Mady is, as you will note, very into social rules), but is that particularly romantic? Or Love in a Spy's Arms. The Tide of Love. The Keegan Inheritance might work, since that's where a great chunk of conflict comes form. Plus, if I ever do get around to writing Alex and Laura's stories, I could have a theme.
Maybe something like The Silver Thread? An Unlikely Love? Improbable Love? Caught in a Cargo Hold? Is it even legal to call it One True Thing, after the song I kept listening to in relation to this story?
Or...I could just use this romance novel title generator I found:Hilarious Title Generator.