A group of social media experts are hired to help an old family business to strive. But they soon find themselves stuck on a tiny island in a lake in which an ancient Swedish witch is said to live.

Park manager Fiona is tasked with taking care of some former friends who won an exclusive private sneak preview of Halloween at Liseberg – a whole night, all alone in the empty park. But cotton candy, lovely rides and lots of laughter soon turn into something completely different, as they realize they are not alone in the park. And the night of dreams quickly turns into a true nightmare.