The sixth feature from writer-director Valérie Donzelli (also an accomplished actress in her own right), co-written with the filmmaker Audrey Diwan (Happening), features a virtuosic Virginie Efira (star of this year’s Rendez-Vous selection All to Play For) in a double role as twin sisters Rose and Blanche. After Blanche falls for Grégoire (Melvil Poupaud) at a party, the two quickly marry and relocate far away from her beloved sibling. But, as an opening scene of Rose telling her story in a lawyer’s office suggests, a sinister dimension to Grégoire quickly emerges, and a marriage that seemed to offer a bright new beginning soon takes on the appearance of something more like a trap. Donzelli’s César-nominated film is a tensely effective erotic thriller that doubles as an acute psychological study of a profoundly disturbing relationship. A Music Box Films release.