Lili, a 19-year-old, discovers her twin brother Loïc has left the house after a violent argument with their father when she gets home from vacation.

Lili recovers and begins looking for her twin by following the trail of the letters she has received along with Thomas, the boyfriend of her friend from school, Lea.

When Thomas arrives at Lili's house for a family lunch, he speaks with her parents, mentioning that he knows of Loïc's death.

Lili, who arrives home shortly after to meet Thomas and her parents for the lunch, finds her brother's guitar hidden in her father's car.

Even though both Lili and Thomas know the truth by now, they don't talk about it, even though Loïc has been the most important thing on their minds for the past year.