After a lifetime of being bad at love, JoJo Burton vows to solve her intimacy issues once and for all at her sister's destination wedding on a cruise ship. Armed with pop psychology, she diagnoses herself with a fixation on the neighborhood guy who was her first crush and first kiss (and who just happens to be a newly-divorced wedding guest).
 
Determined to woo him for closure, she ropes in her childhood bestie, Cooper Watts, as her wingman. Cooper: who RSVPed no, but showed up anyway. Cooper: who moved to London without a word four years ago. Cooper: who broke her heart.
 
Shipboard antics abound in this witty, heart-tugging, childhood-friends-to-lovers romance, as JoJo and Cooper team up, fake flirt, slow dance, share a cabin, sing duets, get jealous, answer long-held questions, and finally, at last, discover truths about each other that will change everything.