March 1992 in a small town in the suburbs of Paris. During an alcohol fuelled party, teenagers discover a body that seems lifeless hidden in the bushes of a forest Two weeks earlier. Simon Werner, a senior in the Science curriculum of the Leon Blum high school has not shown up for class. Blood stains are found in a class-room. Run-away, kidnap, suicide, murder… every scenario is envisaged by his classmates. A few days later, a student from the same class goes missing without her parents knowing where she has gone. A young girl with no dark background or connection to Simon. The next day, a third student, still from the same class, also disappears…