Every week, four young women happily participate in a choir class where gossip and news are happily shared during these weekly reunions. One evening, however, Veronique, their choir director, announces that the next concert, the one on Halloween night, will be the occasion for her to finish with a flourish and to retire. At the same time, mysterious changes are perceptible in the village, obviously something is wrong in Vourles. In Paris, two investigators from the Financial Brigade are also on the alert, a suspicious activity has just been triggered in... Vourles! Let the investigation begin!