Mousse (Isabelle Carre) and Louis (Melvil Poupaud) are young, beautiful and in love, but when drugs invade their lives tragedy rips them apart. When Mousse then learns that she is pregnant, she attempts to put her life back on track and flees to a house far from Paris where, several months later, she is joined by Louis' brother Paul (Louis-Ronan Choisy). United in their grief, Mousse and Paul begin to develop an unusual and deeply moving bond, in Frangois Ozon's tender and moving exploration Of the nature of family and blood ties.