My sister is the one who's supposed to marry the prince.

I'm just here to fake it for one tiny, harmless, royal engagement week.

What could possibly go wrong?

Sweet, shy Lizzy has spent twenty years dreading her arranged marriage to Prince Andrew of Gallantia, the little monster who made her cry every summer of our childhood.

So when she begs me to take her place at the engagement festivities while she finishes the lingerie collection that could change her life, I say yes.

We're identical twins, after all. Same face. Same hair. Same freckle behind the left ear.

Sure, I'm the tougher, hiking-obsessed version of my willowy sister, but His Royal Jerk Face hasn't bothered to really look at Lizzy since we were nine.

No way he'll catch on. Or so I think…

Turns out the spoiled prince I've hated since childhood grew up into six feet of golden-skinned, wickedly charming trouble, who wants out of this wedding as badly as Lizzy does.

His obvious plan? Become the worst fiancé in royal history and scare his timid bride into dumping him before the vows.

Only I'm the one he's torturing, and I don't scare easy.

Now we're trapped in a week of fake-engagement warfare. But somewhere between the water fights, the royal dares, and one almost-kiss that can never happen again, I start to forget that I hate him.

By the time I realize we're both falling hard, it's too late to come clean.

Andrew thinks he's falling for my sister. He has no idea I've been lying my face off since day one.

And when he finds out the truth…this fairy tale is about to go up in flames.

Twin swap. Arranged marriage. Enemies to lovers. Forced proximity. One impossible prince—and one "good girl gone bad" who's about to ruin all his plans.