After a traumatic accident during a hypnosis seance, young psychiatrist Louise opens a new office in the middle of nowhere. When she starts analyzing Theo, a dark and mysterious man, people around her start to die.

Robert, an aging clock-maker, longs to reconnect with his son César in his final days. As César senses the atelier's stopped clocks hold a deeper meaning, he sets out to uncover the truth. Meanwhile, on the Riviera, a shadowy saboteur of timepieces nears exposure, as ambitious young journalist Émilie races to reveal a story she knows could be her greatest.