L'amour est un crime parfait (2013)

After a brief clandestine affair with her forty-something Literature professor and serial seducer, Marc, the beautiful creative-writing student, Barbara, mysteriously disappears. However--even though Marc openly admits he was with Barbara the night before--he seems unworried, and to further complicate matters, the police and the missing student's alluring stepmother, Anna, start asking questions. As friends and investigators alike gradually tighten the noose on the cryptic tutor, much to Marc's surprise, he begins to experience a long-forgotten feeling: a genuine passion for only one woman. Is love the perfect crime?