A new case for Gabriel Lenoir.
In 1912, in Angers, a celebrated singer dies under mysterious circumstances at an avant-garde concert, and soon after, the piano tuner throws himself from the Eiffel Tower. The public is shaken. It’s as if a fatal waltz is sweeping across France— and each new chord could be the last. The investigation is assigned to Lenoir, but the detective is exhausted by ghosts of past traumas, and his partner is deaf and unable to hear the music…