Agent Trouble (1987), directed by Jean-Pierre Mocky, stars Catherine Deneuve as a CIA operative drawn into a dangerous international conspiracy. When a covert operation spirals out of control, political interests, hidden agendas, and institutional manipulation collide. The film blends espionage, paranoia, and darkly serious intrigue in a Cold War–era setting.

A bus of fifty French tourists lay dead. While the driver makes a call, a wanderer, Victorien (Tom Novembre, Denti), boards the bus and robs all the passengers. Returning home he visits his aunt Amanda (Catherine Deneuve, The Hunger), and lets her in on his secret, unwittingly bringing her to the attention of icy hitman Alex (Richard Bohringer, The Cook, the Thief, His Wife & Her Lover). A conspiracy thriller reminiscent of Hitchcock, Jean-Pierre Mocky’s wonderfully eccentric mystery has a light comic touch that carefully balances its grotesque flourishes. Featuring a wonderful cast including César-nominated Dominique Lavant, Pierre Arditi and Kristin Scott Thomas in only her second screen appearance.

Från IMDB:
Amanda investigates her nephew Victorien's murder after he witnessed a government cover-up involving toxic gas deaths of 50 tourists. She finds herself targeted by assassin Alex, tasked with silencing those aware of the incident.