The ruthless owner of a top French champagne house lies bleeding to death in his own underground caves. Baffled by the secretive world of those who make and market champagne, the Reims region Police Judiciaire face a tangle of deadly rivalries, illicit passions and industrial espionage. All of this lands on the plate of Commissaire Denise Caron, the Police Judiciaire's opera-loving young chief investigator. Drawing on her knowledge of medieval legends, and leaning on her team of experts (and her carpenter-lover) she drives her pursuit to a heart-stopping finale.