Central protagonist and pharmacist who murders two young women. Selected as a juror in the trial of Khader Boualam, who is falsely accused of one murder. Tormented by guilt, he attempts to acquit Khader by exposing investigative flaws, ultimately confessing to his wife and the lead captain before committing suicide and leaving a confession letter.
Grégoire is the true killer whose silence directly leads to Khader's wrongful prosecution.
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