Your sister’s best friends from school, an adorable pair of twins, press a cocktail the color of a bruised sunset into her hand and encourage her to take just a sip. C’mon, just one! So she does.

And it tastes…amazing. Nothing like the cheap beer they’d sneak on campus. Before she knows it, she’s finished her first and the twins are handing her another. And she downs that, too. Easily, and it’s as refreshing as a glass of orange juice.

And after the second drink the twins manage to drag their normally shy friend onto the dance floor and begin to twirl under skies so beautiful she can hardly believe this is real. Any of it.

Of course, the men notice her because there’s no one else at this party quite like her. In a sea of bodies trying too hard, she is an effortless beauty, full of laughter and light.

First comes the handsome Italian lifeguard, just a few years older than your sister, but much more experienced in the ways of the islands. So he’s not entirely surprised when he’s nudged aside by a trust fund kid with a yacht—and this kid mentions the yacht a lot. Soon your sister and her twin friends are tipsy enough to agree to go see the yacht, a Squadron 60 (whatever that is—your sister doesn’t know), anchored just off the beach.

Once they’re on board, however, the yacht’s captain cozies up to your sister. He’s in his forties, but the captain is charming enough to make your sister fall for him just a little, even though a voice in the back of her mind screams, He’s twice your age! But he pours her shots of clear, sweet rum between dances, and she kind of loves how she feels in his muscular arms.…

Sometime after midnight, the party is broken up by local cops. It’s not so much a raid as a gentle shakedown, in which the trust fund kid is expected to fork over a tiny sliver of said fund. When your sister looks around, she realizes the twins have already left the yacht, pretty much abandoning her.

One of the cops is kind enough to offer her a ride back. He’s very friendly. So friendly, he insists on a good-night kiss before she goes home. She offers him one. He pushes things further. She pushes back. He gently insists with the manner of someone who is used to hearing no, but also used to completely ignoring it.…

Now imagine your sister coming to her senses a little. Those old warnings from Mom and Dad are nagging at her, so she parts ways with the cop and decides to go for a walk to clear her head. Sand beneath her feet, ocean spray on her face, and all that. This was a nice diversion to fantasyland, but now it’s time to return to reality.

But it’s darker on the beach than she realized. And before she can make it back to the party—hands reach out from the darkness and grab her.