Requiem for a Killer (2011)

Plot

Lucretia, a skilled assassin known for her lethal poisons and love of opera, faces a challenging assignment in the Swiss Alps. Disguised as a performer at the prestigious Festival d'Ermeux, she must eliminate British baritone Alexander Child, who stands in the way of a lucrative pipeline project after a recent legal victory against British Oil. As she navigates the glamorous and treacherous world of high-stakes performances, Rico, an agent from French counter-espionage, infiltrates the orchestra to thwart her mission. The tension escalates as loyalties blur and danger lurks behind every note.