L'Argent du Ministre(1980)

Minister Melone, his mistress, and his bodyguards, before heading to Luxembourg to drop off a briefcase filled with embezzled money, stay in a hotel. Lord and Lady Duncan also arrive, welcomed by Sophie, daughter of Professor Moricet, an eminent weapons researcher. They are at a show where a strange couple is watching them... Moricet is kidnapped with his briefcase containing top secret plans. From then on, detectives, briefcases, spies, and guards intertwine in a relentless and eventful pursuit! Which of them will recover the 'real' briefcase?