Alain is clearly is very fond of his daughter, as we see him dancing tenderly with her. But later in the day they realise that she is nowhere to be seen. After questioning some of her friends, it transpires that she had a boyfriend, Ahmed, a fact not known to the family. When she doesn't turn up Alain visits Ahmed's father, and also goes to the police, who aren't particularly helpful. In time it becomes known that she has left with Ahmed, and this sets Alain off on a mission to find her.
The years pass and with Georges now a young man he and his father continue the search, although Georges is less committed than his father. Kelly has previously let the family know that she doesn't want to be found and that she has a new life. They also learn that she has a child. None of this dissuades Alain who becomes more and more obsessed. Georges finally refuses to help any more and tragedy strikes when his father falls asleep at the wheel of his car.
We next see Georges helping an aid organisation in Pakistan, this being a means of pursuing the search for his sister. He has in effect taken up his father's mission, perhaps belatedly realising that his father was right. A series of events lead to Georges returning home with with a muslim woman, Shazana, who was Ahmed's wife, Kelly having left Ahmed. The cowboy community will not accept Shazana, as feelings were running high in America after the 9/11 atrocity.
This film was presented at the 2015 Cannes Festival and received largely favourable reviews. It is considered to be a contemporary interpretation of John Ford's great western, The Searchers.