An intimate and moving short documentary where a young Franco-Lebanese director has a heartfelt exchange with her mother, Kawssar, as they spend time together in her late grandmother's house. In a space now filled with nostalgia and emptiness, Kawssar recounts how Lebanon's civil war drove her into exile and how she had to cope with the loss of family members, all the while poring over her mother's diaries. A transgenerational story, Mon Raison d'Être explores grief, loneliness and motherhood, lifting the veil on things left unsaid. A delicate journey of a filmmaker and her mother, struggling within their own relationship and ultimately trying to heal together.