Algeria, June 1955. Khadidja leaves Kabylia to join her older brother Malek in Algiers. Following an altercation at the market, he is arrested by the police, leaving Khadidja on her own. Fortunately, Lyes, Ahmed and Philippe will do everything they can to help her find Malek. From the rooftops of the Casbah, the four children set about investigating.