Each day, in honour of a Parisian tradition, a town crier calls out the local news to all who will listen. Over the course of a few days a number of disturbing messages are slipped in to his box, messages of portentous & malicious intent referring to the Black Death. Strange marks have also appeared on the doors of several buildings: symbols once used to ward off the plague. Detective Commissaire Adamsberg begins to sense a connection, even a grotesque menace. Then charred & flea-bitten corpses are found. The press seizes on their plague-like symptoms, & the panic sets in.