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Moderated by Laetitia Marie Ndiaye, Columbia University. Book synopsis: Strange signs in black paint on doors all over Paris. At first glance, one might believe the work of a tagger. Commissioner Adamsberg detects a dull threat, a hint of evil. For his part, Joss Le Guern, the Town Crier of the Place Edgar-Quinet, wonders who slips into his message box of incomprehensible announcements.