Damien and Nadia, 34, leave Paris with Chloé, their 8-year-old daughter, to settle in the provinces. Graphic designer for an events company, the first negotiated a full-time telework to follow his partner who has just been offered a position at the Rivière Research Institute where her friend and colleague Marion already works. The couple are expecting a child. But behind this new beginning hides a deaf threat that will soon implode the happiness of this seemingly perfect family.

Simon Cordier, a French magistrate and amateur sculptor comes into contact with a malevolent entity. The invisible – yet corporeal – being, called a “horla” is capable of limited psychokinesis and complete mind control.