Léa Fournier, a celebrated Parisian therapist, hides a dark secret: years ago, a car accident she caused killed a man, leaving her haunted by guilt. When a mysterious stranger appears with evidence of her past and a connection to a secret emotional manipulation experiment, Léa is thrust into a deadly game of pursuit and revelation. Guided by the music of those lost, she must confront her trauma, unravel a conspiracy involving memory and happiness, and face the dangerous forces determined to exploit it. In the end, she discovers that true happiness lies not in control, but in surrender and acceptance.
