Question: Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: What does Viviane do for a living? Movie plot title: Rififi Movie plot: Tony "le Stephanois" has served a five-year prison term for a jewel heist and is out on the street and down on his luck. His friend Jo approaches him about a smash-and-grab proposed by mutual friend Mario in which the threesome would cut the glass on a Parisian jeweler's front window in broad daylight and snatch some gems. Tony declines. He then learns that his old girlfriend, Mado, took up in his absence with gangster Parisian nightclub owner Pierre Grutter. Finding Mado working at Grutter's, Tony invites her back to his rundown flat. She is obviously well-kept, and Tony savagely beats her for being so deeply involved with Grutter. Tony changes his mind about the heist; he now accepts on the condition that they rob the jeweler's safe instead of the window. Mario suggests they employ the services of Italian compatriot Cesar, a safecracker. The four devise and rehearse an ingenious plan to break into the store and disarm its sophisticated alarm system. The caper begins with the group chiseling through a cement ceiling from an upstairs flat on a Sunday night. The suspenseful break-in completed, the criminals appear to escape without leaving any trace of their identities. However, without the others' knowledge, Cesar pocketed a diamond ring as a bauble for his lover Viviane, a chanteuse at Grutter's club. The four men arrange to fence the loot with a London contact. Meanwhile, Grutter has seen Mado and her injuries, who breaks off their relationship. Infuriated at Tony's interference in his life, he gives heroin to his drug-addicted brother Remy and tells him to murder Tony. Grutter sees the diamond Cesar gave to Viviane and realizes that Cesar, Mario, and Tony were responsible for the jewel theft. Grutter forces Cesar to confess. Forsaking a 10 million franc police reward, Grutter decides to steal the jewels from Tony's gang, his brother Remy brutally murdering Mario and his wife Ida when they refuse to reveal where the loot is hidden. Tony retrieves it from the couple's apartment and anonymously pays...
Answer:
Sing at Grutter's club.