Editor’s Note: This review originally appeared as part of our Sundance 2013 coverage, and now A Teacher being released into theaters near you. This year’s Sundance Film Festival was rife with films about inappropriate sexual relationships, especially already-shocking May-December dalliances made still more inappropriate by uncomfortable power dynamics. Drake Doremus’ Breathe In tackled the almost-romance between an exchange student and her male guardian (one who was also her teacher), Liz W. Garcia’s The Lifeguard featured a twentysomething female lifeguard who takes up with a teen boy who lives in the condo complex where she works, and Anne Fontaine’s Two Mothers centered on adult female friends who both fall in love with the other’s son, ensuring that Hannah Fidell‘s A Teacher would fit quite neatly in the festival’s most trendy programming. But fortunately for the director/writer/producer, Fidell’s finely tuned feature is a stand-out film in an apparently crowded field. Unlike both Breathe In and The Lifeguard, Fidell’s film doesn’t track those first hesitant steps toward sex and romance between a disastrously (and often criminally) mismatched pair as, when we meet high school teacher Diana (an astonishingly good Lindsay Burdge) and her student Eric (Will Brittain), they’re already in the middle of their sexual relationship. All is not well, of course, and composer Brian McOmber‘s loud and abrasive (and we mean that in the best way possible) score, which queues up the second the film opens, makes sure we know that from the get-go. This is a doomed relationship in every sense.