Very classic but well done. A small closed community that shares a dark secret and temporary visitor that gets trapped there slowly uncovering the truth, nothing original there. An island closed for the winter, a little storm for the atmosphere, a bit of family history. Really nothing new.

We never leave the main character, always following her. Not gonna lie, a lot of scenes are just her wandering around in different places with an oppressing atmosphere.
All other characters only have a few lines and barely any plot impact. The inhabitants are weird, not really friendly but they're not an active threat either ([spoiler]only passive victims[/spoiler]), they just add to the oppressing atmosphere.

So how does she learn the truth if there are barely any interactions with anyone ? Well, turns out she doesn't discover it slowly on the island, only we do, she's been told the whole thing before even the beginning of the story, and just didn't believe it.

The whole thing works pretty well.