The kidnapping of a little girl creates tension and suspicion in Algiers. Only Dounia, a brilliant psychiatrist, and Sami, a police inspector, can unearth the demons of the past.

In the city of Guelma, which was once called Heliopolis in ancient times, the daily life of an Algerian family takes its usual course. But on May 8, 1945, the day the end of World War II was announced, demonstrations by the Algerian people against the French colonial power and for the country's independence took place, which were bloodily suppressed by the French army and French settler militias. The event went down in history as the Sétif and Guelma massacre.

For thirty years, French-Algerian sisters Zorah, Nohra and Djamila have been living in the hope of finding their brother Rheda, abducted by their father, and hidden in newly decolonised Algeria. Their relationship is shaken when Zorah, the eldest sister, decides to write a play based on the traumatising events of their childhood that haunted them their whole life. But when they learn that their father is dying, the three sisters decide to go to Algeria to seize their last opportunity to have him reveal where their brother is. When the past catches up, the three sisters have no choice but to put their differences aside.

Salima, an independent artist, finds a cell phone on her way. What seems like an everyday occurrence soon turns into a disturbing experience: insistent calls, a voice demanding answers, and tension that drags her into losing control of her own reality.