Faustine is a teenager. She wants everything to match her dreams. She spends her holidays with her grandparents, she is fascinated by the neighbors who live in a big blue house. She observes, but does not dare to meet them. She is a bit voyeur, slightly perverse. By dint of observing, she is invited to spend her days with the family. There is Jean the father who is remarried recently to a younger woman, Claire, his two sons Joachim and Florent and his brother Julien with two daughters, Camille and Ariane. Claire appears ready to seduce her handsome stepsons, but Florent is more interested in Faustine; Although initially excited by Florent's advances, Faustine soon realizes that he is not the man for her. Instead, she falls for the charms of the much older Julien and imagines that he reciprocates her feelings.