When one of the Montecito's guests wins big, his wallet is snatched before he can indulge in his winnings, forcing Danny , Sam and Ed to search the premises for the thieves. When the wallet is graciously returned, Danny and Sam give the Good Samaritan a priceless reward. Elsewhere, there is a suspicious machine on the floor with an unusually high payout pattern, and it's up to the Montecito's security team to figure out if it's a defective machine or a strategically deceiving guest. Meanwhile, Ed's thoughts are preoccupied with jealousy and suspicion when he finds out that Jillian (Cheryl Ladd) has been hanging out with the artist playing at the Montecito, Marc McGrath (as himself) and an overzealous agent pesters Mary trying to get her talent-less client a gig at the Montecito.

Nessa is stunned when a mysterious woman shows up at the Montecito with news that her father is alive and wants to communicate with her. She begins to question what Ed has told her of her father's whereabouts which leads her right into a trap that affects the whole casino. Meanwhile, when a video gaming convention takes over the hotel, Sam, Danny and Mike have to police fraudulent acts of plagiarism. Elsewhere, Mary befriends a hotel guest who lost her husband after ten year s of marriage and is desperate to keep his memory alive.

In the third season premiere, Ed's got major problems as the revamped Montecito struggles to finish work in time to re-open on new boss' Monica Mancuso's (Lara Flynn Boyle) schedule as he also tries to lure back Danny and his former staff to prevent a suspected "smash-and-grab" heist that has hit other casinos. But convincing Danny and the gang proves to be difficult since each has his or her reasons for leaving, and what's more, Ed suspects two construction hard-hats are planning an inside robbery once the Montecito's doors swing open again amid much fanfare.

The casino has reopened. Ed and Mike work on a case of counterfeit casino chips. Per his accountant's suggestion, Danny must sell his father's house. Later, Danny's accountant is part of a poker game where one of the players is a man who robs one of the casino's guests. Monica Mancuso, the new owner, wants a dealer to be fired because he keeps dealing winning hands to the players.

Ed, Mike, and Danny make a bet on who's the best security operative among them and who can find the Montecito's biggest source of loss. Sam helps Polly (the manicurist) get her boyfriend back. Mary manages to sell the last residential suite, and she hopes that a special performance by John Legend will be a success for the Montecito.