Pierre, a professional dancer, suffers from a serious heart disease. While he is waiting for a transplant which may (or may not) save his life, he has nothing better to do than look at the people around him, from the balcony of his Paris apartment. When Elise, his sister with three kids and no husband, moves in to his place to care for him, Pierre does not change his new habits. And instead of dancing himself, it is Paris and the Parisians who dance before his eyes.

Clémentine, a teacher in a French School in Bucharest, lives with her husband, Lucas, in a remote real estate in Snagow. During the night, Clémentine is woken by weird noises outside their house, and Lucas sees their car being stolen. The lights are turned off, the phones are disconnected and they see that they are no longer alone. When weird lights appear outside, they hide in the cellar and try to ask for help from what could be a dreadful night of pure terror.

In Marseilles, the discredited and alcoholic Detective Schneider hijacks a bus and forces the bus driver with a gun to drive him home. He is arrested by the swat force and his washed up career in the police department practically ends. Schneider is removed from the investigation of a serial-killer that is committing hideous crimes against women and assigned to a bureaucratic work in the night-shift in the precinct. Through glimpses from his recollections, Schneider recalls the tragic accident that killed his daughter and left his wife attached to a life support system. Meanwhile, the sick criminal Charles Subra, who killed the parents of two girls many years ago, convinces the probation committee in the prison that he has found God and is regenerated and may be released. Justine, one of the daughters that survived, has never overcome the trauma of her loss and is worried with the possibility of the freedom of the criminal...