After a successful experiment on Algernon, a mouse whose level of intelligence thanks to that procedure dramatically increased, the scientists decided to go further - the next "guinea pig" is Charles, a mentally disabled young man. The experiment is again successful. But what happens after it?

Marie-Thérèse really doesn't know how to make ends meet anymore. It's hard to find a place among the growing number of comedians in Switzerland; the circus is in crisis, there aren't even any elephants anymore! So it's by renting a large eight-room apartment and putting girls to work there that dear Marie-Thérèse finally manages to make a little extra cash, albeit under the pretext of giving rhythm classes! Upon discovering this highly dubious activity, the landlord decided to intervene and try to evict everyone from his apartment, which had been turned into a brothel.

Real estate agencies, property managers, and rental agencies are not always kind to their tenants. But when the tenant is Marie-Thérèse Porchet, she becomes a nightmare for her landlord! Especially when she decides to rent an apartment in Geneva and turn it into a fashionable brothel. Upon learning of these dubious activities, the management company decides to terminate her lease. But Marie-Thérèse is not going to take this lying down.