The film tells the story of a 28-year-old heroine who cannot bear the pressure of her boyfriend's proposal, so she chooses to escape by making friends with middle school students. Keira Knightley plays a young woman named "Megan" in the film. Her boyfriend (Mark Webber) planned an ingenious proposal, which frightened her, so she found a place to hide with her 16-year-old sister Annika (Chloë Grace Moretz) under the pretext of vacation. Sam Rockwell will play an old man named "Craig" in the film.