Sixty five years old Abdelkader Silimani, an Algerian Muslin living in France, after inadvertently witnessing a murder, closely escapes from the murderers by hiding out into a mosque. The black leather dressed masked murderers, with their firearms in hand, do not hesitate to enter the mosque full of praying men looking for the eyewitness. They leave empty handed but determined not to give up their search.
Detective Leclerc is assigned to the case. As he searches for the eyewitness who stays mute with fear, the detective slowly discovers the Northern Paris Muslim community and its traditions. For the first time, the French detective is exposed to the contradictions and challenges minority communities face as they struggle to live in a new culture with a different set of values and religious beliefs.