In a rural Spanish town Sara, an overweight teenager, is the victim of constant and cruel bullying by a bunch of mean girls. When she goes to the town's pool at the time she knows nobody is going to be there, she stumbles upon a mysterious stranger and is surprised by the arrival of her tormentors, who start their usual bullying. What will Sara do when she realises that the stranger has abducted her tormentors? Pereda's formidable debut takes as a starting point adolescence insecurities and delivers a grisly and ferocious psychological horror film which premiered at Sundance Film Festival this year.