A Certain Mister (Un certain monsieur) 74 years old

Documents relevant to National Defence have been concealed in a certain vase by a dangerous gang of robbers. To neutralize the criminals, a seasoned police commissioner and his clumsy assistant, young inspector César, join forces with a colorful trio of thieves nicknamed Le Pouce (Thumb), L'Index (Index Finger) and Le Majeur (Middle Finger)...