[1] Adriano Celentano performs the role of Guido Quiller, the inventor and main patent proprietor of a virtually indestructible type of armored glass, which is used to secure jewelry shop windows.

Its success occurs at the chagrin of several influential insurance companies, mainly the La Suisse Assurance in Geneva, who see their winnings from one of their most profitable income niches dwindling, so they attempt to gain the patent to the invention and then get rid of it altogether.

Her condition for the divorce from Guido would be that he should transfer all his exclusive rights to the production of the Quiller glass - and thereby his whole fortune - to her, whereupon she would sell them to the Swiss Assurance and gain a princely monetary compensation in return.

As he races after Maggie on a defective Vespa to return her handbag she had accidentally left behind, Guido attracts the attention of Tilli, a pickpocket working the local subways who has a passion for horoscopes and Arsene Lupin, and her brother Momo, a bumbling counterfeiter, two members of a family clan of petty criminals.

The next day, however, Guido sets a trap for Tilli at her usual haunt and drags her into the next plane to Geneva, where in the office of the Suisse Assurance he demonstrates his true intentions by making her witness him surrendering his entire fortune to his ex-wife in return for the divorce.