Everything in Maisie Cohen’s life is going to plan. She has a stable job, great friends, and a long-term relationship that has finally progressed to happily ever after … or so she thinks. 

Her best friend Nate was never her fiancé’s biggest fan, but it comes to a head when he crashes the bachelor party and shows Maisie who she’s really marrying. In the aftermath, her fiancé forces her to choose who to keep in her life: him, or Nate. She immediately cancels the wedding—the easiest choice she’s ever made.

Maisie might be falling apart, but she figures someone should take advantage of the cruise booked for the honeymoon, and there’s no one more deserving of a vacation than her best friend. What she doesn’t expect is for Nate to insist she come with him, despite her fear of water.

But in close quarters, she can’t help but notice the distance between her and Nate that wasn’t there when they were kids. Even worse, now that she’s single for the first time in her adult life, she’s beginning to see her best friend in a whole new light.

Maisie knows she needs to keep herself in line and not rock the boat. She can’t bear the thought of ever losing Nate. But as they go on adventures together, navigate her fears, and fight over who gets the single bed, she’s never been more tempted to ruin the friendship.