The girl Oma (Emma Roberts) is a brave girl with a very distinct personality. One day, when she woke up, she found herself on an isolated island called "Paradise Mountain". Here, there stands a sanatorium where rich girls from all over the world live. Their parents hope that they can learn how to become a perfect woman here. The Duchess (Milla Jovovich) is the ruler here. The girls worship her very much, but also fear her. Here, Oma meets Emana (Eiza González), Rain (Awkwafina) and Chloe (Danielle Macdonald), and soon they discover the dark and dirty secrets hidden behind this sanatorium.