Leighton Trent’s review published on Letterboxd :
This early Polanski paved the way for an even great effort in Rosemary's Baby, but what he manages here is something masterful. The idea of losing control of one's sanity is something hard to convey well in film, especially since it's a cerebral and you have to show it visually. Here, he and Deneuve manage to deliver it together expertly. She's perfect in conveying her increasing loss of reality, while he cuts between the real world and her illusions with such dexterity that it keeps us on our toes constantly as the viewer. While it's not perfect, and feels a tad clunky in its narrative at times, this is nonetheless expert early work from one of cinema's greatest.