Momo steals a dog from a pet shop. He later impulsively sells the dog for 500 francs and stuffs the money into the sewer. Rosa, who regards Momo as a troublemaker, takes him to her physician Dr. Katz under the belief that he is syphilitic or mentally ill. Momo later follows her after she has a nightmare about the Auschwitz concentration camp to discover her hidden Jewish space under the staircase, and the two begin to develop a closer bond. Later, after Momo dresses himself up as a prostitute and a real prostitute takes him to a cafe run by a friend of Madame Rosa's believing that he needs help, Madame Rosa makes Momo swear never to prostitute himself or become a procurer. In a park, Momo meets a female film editor, and she tells him he can visit her lab any time he likes.