Le plaisir de chanter (2008)

An oversexed secret agent and her timid partner stalk a businessman's widow in Le plaisir de chanter (The Joy of Singing) (2008). After a wealthy banker dies, intelligence agents suspect foul play, so they put pushy sexpot spy Muriel (Marina Foïs) and her boyish partner Phillippe (Lorànt Deutsch) on the case. The duo join an opera class frequented by the banker's widow, Constance (Jeanne Balibar), in order to get closer to her; a kooky calvacade of singing, spying and sex follows. Speaking of, your pants will hit a high note when Jeanne goes full frontal for a scorching Sapphic scene.