Living in Paris, 24-year-old David is close to his sister Sandrine – a single mother – and her seven-year-old daughter, Amanda.
He meets Lena, a piano teacher.
Sandrine goes to the park with friends where, in a terrorist attack, she is killed and Lena injured.
David looks after Amanda but, even with the help of his aunt Maud, he isn’t sure he can cope and considers sending her to a children’s home.
Amanda initially wants to stay with Maud but, as she and David begin to bond, she changes her mind.
Lena moves back home to Bordeaux but David asks her to move in with him. He then takes Amanda to London to meet his estranged mother Alison, and to visit Wimbledon.
As their relationship deepens, David decides to become Amanda’s guardian and to adopt her.