The film tells of the events that began in the summer of 1991 when wealthy heiress, Ghislaine Marchal, was found murdered in the basement of her home with the message "Omar M'a Tuer" (grammatically incorrect French, approximately "Omar has kill me") written beside in her own blood. Despite a lack of forensic or DNA evidence, her Moroccan gardener, Omar Raddad, was immediately charged, found guilty and sentenced to 18 years in a French prison. Shocked by the case and convinced of his innocence, journalist Pierre-Emmanuel Vaugrenard moved to Nice to investigate.