Translation of: Trois.

1986: Adrien, Etienne and Nina are 10 years old when they meet at school and quickly become inseparable. They promise each other they will one day leave their provincial backwater, move to Paris, and never part. 2017: A car is pulled up from the bottom of the lake, a body inside. Virginie, a local journalist with an enigmatic past reports on the case while also reflecting on the relationship between the three friends, who were unusually close when younger but now no longer speak. As Virginie moves closer to the surprising truth, relationships fray and others are formed.