Guillaume Musso. The Girl and the Night

December 1992.
Under mysterious circumstances, a student named Vinca Rockwell disappears from the campus of a prestigious high school. Rumor has it she ran away with Alexis Clement, a professor with whom she was rumored to be in love. But only a few people know the terrible secret: Vinca couldn't have run away with Clement because he was murdered that same night.
May 2017.
The Lycée is celebrating its anniversary. Writer Thomas Degalais is coming to his hometown for the alumni reunion. For 25 years, he's been haunted by the mystery of Vinka's disappearance, the woman he loved. He's also haunted by a guilty conscience—he knows better than anyone the circumstances of Clément's murder. And he absolutely doesn't want these circumstances to become known.
On the night of May 13th to 14th, Toma will unravel the mystery that has haunted him for a quarter of a century, albeit at a very high price.