Algiers, summer 1955. The city is in turmoil, and tensions are rising. Khadidja, a sharp nine year old girl, meets Lyes, Philippe, and Ahmed under unexpected circumstances when her older brother, Malek, is unjustly arrested by the police during a chaotic market scene. From their secret hideout on the rooftops of the Casbah, the four friends embark on a dangerous and mysterious investigation to try to rescue him. Together, they experience an unforgettable summer filled with action, courage, and adventure, one that will forge a lasting bond between these four children from different communities and prove that true friendship and the pursuit of justice can overcome any barrier.