Love Is the Perfect Crime (2013)

Marc, in his 40s, is a professor of literature at the University of Lausanne. Still a bachelor � and still living with his sister Marianne in a huge, isolated chalet that they inherited when they were very young � he carries on one love affair after another with his students. Winter has almost ended when one of his most brilliant students, Barbara, suddenly disappears. Two days later, Marc meets Barbara�s mother, Anna, who wants to find out more about her vanished daughter.