Parents send their daughters to Our Lady of the Nile to be moulded into respectable citizens, and to protect them from the dangers of the outside world. The young ladies are expected to learn, eat, and live together, presided over by the colonial white nuns.
It is fifteen years prior to the 1994 Rwandan genocide and a quota permits only two Tutsi students for every twenty pupils. As Gloriosa, the school's Hutu queen bee, tries on her parents' preconceptions and prejudices, Veronica and Virginia, both Tutsis, are determined to find a place for themselves and their history. In the struggle for power and acceptance, the lycee is transformed into a microcosm of the country's mounting racial tensions and violence. During the interminable rainy season, everything slowly unfolds behind the school's closed doors: friendship, curiosity, fear, deceit, and persecution.