August 1979: twelve-year-old Michael Saint-Pierre disappears in the woods near Rivi?re-aux-Trembles when he and his friend Marnie Duchamp encounter a sudden storm. After an extensive search, only a muddy sneaker is found. Thirty years later, in a neighboring town, little Billie Richard, who is about to celebrate her ninth birthday, fails to return home after school. Again, it's as if she's vanished into thin air. Just like Marnie,...