Helga spends a few days with her grandparents whom she hasn't seen for years, two sinister old men living in a huge Catalan farmhouse lost in the middle of nowhere.

Abril and Yula prepare a potion to make a classmate disappear. When she is missing the next day, they both swear never to talk about it, a promise that will put them to the test. Abril will have to cope with Yula's betrayal.