Passion 2013

Christine, an American advertising executive in Germany, teams up with her protégé Isabelle on an ad campaign for a new smartphone. Isabelle, who is secretly having an affair with Christine’s boyfriend Dirk, comes up with a clever marketing idea that earns widespread praise. When Christine claims the concept as her own, Isabelle feels betrayed, but she softens the moment by hearing about Christine’s past: the story of how her twin sister died.

Encouraged by her loyal assistant Dani, Isabelle uploads a self-made version of the ad to the web, and it quickly goes viral. The attention unsettles Christine, who vows revenge and taunts Isabelle with a sex tape that Isabelle had made with Dirk. After a fit of anger, Isabelle crashes her car in the company’s parking garage, and Christine shares the security footage with the entire company, publicly humiliating Isabelle. The humiliation triggers a downward spiral for Isabelle, who battles depression and begins abusing pills. In response, Christine tries to push Dani out of the loop and even threatens Isabelle with a revenge letter she typed on Isabelle’s computer.

When Christine is found dead, Isabelle is arrested and confesses to the murder while in a drug-induced stupor. Based on her confessions, the revenge note, and fibers matching a scarf Isabelle was seen wearing, the police charge Isabelle with murder. The charges are dropped, however, when a ballet-goer who saw Isabelle that night emerges and when Dani discovers Isabelle’s scarf, undamaged, in her apartment. The police then uncover that Dirk had been embezzling money and that Christine had discovered this; a bloody scarf found in his car leads to his arrest.

The true reveal comes when it’s shown that Isabelle murdered Christine and staged the events to convince others that she was unraveling. Dani, secretly in love with Isabelle, reveals she captured Isabelle on video at various moments during the night of the murder and tries to blackmail Isabelle into becoming her lover. That night, Isabelle experiences a strange dream in which she strangles Dani after being seduced, but Dani sends the incriminating footage to the investigating detective. Then Christine’s twin sister appears and strangles Isabelle from behind with a bloodstained scarf. Moments later, Isabelle wakes up in her own bedroom from the nightmare, only to confront a second nightmare: Dani lying dead at the foot of her bed.