AllMovie

The "Gran Duquesa" of the title is a White Russian noblewoman who's alive and well and living in Argentina. The Duquesa is informed by an expatriate duke that the keys to the mansion where the crown jewels are kept have been hidden somewhere in Buenos Aires. This variation on the old Twelve Chairs yarn begins to get interesting when a carefree streetwalker comes into possession of one of the keys. And there's also a romantic subplot, for the benefit of those not interested in knockabout farce. Of the huge cast, Alberto Bello is a standout as the Duke.