Taking advantage of lax gaming laws allowing him to work at the casino while his gaming license is still pending, Sam becomes practically the Tangiers' boss and doubles the casino's profits, which are skimmed by the Mafia before the records are reported to income tax agencies. Sam 'Ace' Rothstein (De Niro), a sports handicapper and mob associate, is sent to Las Vegas to run the Teamsters-funded Tangiers Casino on behalf of several Midwest mob families. She ends up being a self-destructive woman, her primary weakness being in wanting to help a friend, a hanger-on and loser named Lester Diamond. It is also placed into jeopardy by who becomes Ace's wife, Ginger McKenna, who he knew was a hustler when he married her and who he wants to trust in every aspect of the word in his love for her. Ace's success is placed into jeopardy by Nicky, not only by his reckless, violent, volatile and ruthless behavior, but also by his want to eke out his own gangster fiefdom in Las Vegas. Ace is able to make a success of the casino, which includes the process of the Mafia bosses being able to skim profits off the top, while making the entire business look legitimate to the authorities. Ace's best friend from childhood Nicky Santoro, eventually comes along for the ride, he who the Mafia hires to be Ace and the organization's unofficial protector. Ace can do the job, applying for his gaming license despite his past, while having his ever changing job title be anything but running the casino and the actual license getting lost in the never ending process.

In 1975, bookie and expert handicapper Sam Rothstein - Ace to his friends - goes somewhat legitimate when the Chicago based Italian Mafia hires him to run the Tangiers Casino on the Las Vegas Strip.

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