On the edge of Paris two small-time drug dealers have had their throats cut in a peculiar fashion. Setting out on the trail of the shadowy killer, Commissaire Adamsberg and his detectives travel between Paris and the Normandy countryside. Adamsberg’s investigation into these horrible deaths brings him into contact with the attractive Ariane Lagarde –a pathologist who caused him professional grief some twenty-five years ago. There’s also a new lieutenant on the scene, whose ties to Adamsberg’s past create tension and hostility in his present.