The Best in the World follows Mouctar, a Guinean migrant navigating a new life in Paris. He enrolls in a non-profit school for migrants in Paris, where he meets Marion, an American social worker who runs an after-school theater workshop, which he eagerly joins. During interviews for the thesis Marion is writing, theater workshops, and immigration procedures, Mouctar tells a tragic tale of why he left his home. But the struggles he encounters as a migrant in Paris trigger nightmares that hint at a far darker truth.
During a theater workshop, Mouctar is forced to confront his heartbreaking past. When he finally shares his truth, Mouctar forms a bond with Marion that helps him begin to heal from his nightmarish childhood and forgive those that hurt him.