When rancher Ralph Lamb reluctantly accepts the role of sheriff in 1960s Las Vegas, he now has the authority to take on the mobsters looking to cash in on the casinos. Chicago mobster Vincent Savino is the new general manager of the Savoy, the swankiest casino on the strip, and they instantly clash as Lamb investigates the murder of the governor's niece.
Sheriff Ralph Lamb, his brother Jack and son Dixon investigate the murder of a craps dealer in an apparent home robbery that seems to be connected to a matching crime. Meanwhile, Savino needs to quickly figure out how to gain the trust of his new count room manager assigned to him - Mia Rizzo, the daughter of a mob boss in Chicago - if he ever wants to achieve his goals in Vegas.
When Mia's father Johnny, a hot-headed mob kingpin with a gambling problem, visits the Savoy, it causes Savino problems and gives Sheriff Lamb a reason to break out the handcuffs.
When Savino tries to invest in the same casino that the local Milwaukee crew has been eyeballing, Milwaukee comes after him. Meanwhile, when Sheriff Lamb investigates the murder of an African American maid, he's surprised to uncover her connection to one of the town's most wealthy businessmen.
Sheriff Lamb suspects Savino of kidnapping the son of a member of the Nevada Gaming Commission in order to fast-track a gaming license for The Tumbleweed. Meanwhile, when Savino's wife, Laura, comes out to Vegas to support him in a new venture, his promise that their family will be safe there is put in jeopardy when a ruthless hitman from Milwaukee arrives in town.
Savino decides it's time to put a new, mob-friendly mayor in office, and with his wife Laura's help, grooms George Grady for the campaign. Meanwhile, Sheriff Lamb investigates the murder of a dentist who appears to have been killed because of his gambling addiction. Gil Bellows guest stars as Mayoral Candidate George Grady.
Sheriff Lamb finds himself in the unusual position of protecting Savino when Milwaukee puts out a hit on the mobster. Also, the results of the mayoral election are in.
Rizzo complicates life for Savino when he hires a popular singer at the Savoy who is also Savino's ex-mistress, Diane Desmond. Meanwhile, Ralph, Jack and Dixon share jurisdiction with the military on a murder case when clues lead them to a nearby Air Force base.
When a young Vegas showgirl is attacked and murdered, the Lambs work to track down the killer, realizing early on that there's something about the case that resonates personally with Katherine. Meanwhile, Savino manages to land a high roller at the Savoy and tries to use him to show other "whales" that the Savoy is a real contender for high stakes gambling.
Sheriff Lamb assigns Dixon an undercover job at the Savoy when Savino suffers a series of robberies, while Ralph and Jack look at the mob when they investigate the murder of the biggest contractor in Las Vegas.
Sheriff Lamb is kidnapped by a suspect bent on revenge, and is forced to dig his own grave. Meanwhile, Savino and Rizzo are roughed up by a rival mob and must come up with a deal quickly to try to save their lives, and Katherine and Laura embark on a new partnership.
The entire Lamb family is blindsided when a former flame of Sheriff Lamb's shows up asking for help in finding the man who beat up her husband. Meanwhile, Savino confronts the snitch inside his casino and deals with it in a startling way. Frances O'Connor guest stars.
Jack is in dire trouble when he's blindsided by Mia's father, Rizzo, who wants to grill him about his daughter. Meanwhile, Dixon saves a drowning girl and discovers she was poisoned, and Savino and his Savoy crew find themselves stranded in the desert overnight.
Jack needs to break devastating news to Mia, while he hides crucial information from her and his brother Ralph.
Savino, Mia and Tommy have their hands full when a Hollywood producer and his ing'nue, Violet, breeze into the Savoy. When Tommy finds himself over his head when tasked by Savino to keep an eye on Violet, he hires a very willing Dixon to shadow the starlet.
Sheriff Lamb and FBI Agent Byrne butt heads when Byrne prevents Lamb from pressing charges against a pimp in order to get info on Savino instead. Also, Dixon falls hard for Hollywood starlet Viola (guest star Anna Camp), and Tommy and Dixon discover that Yvonne has a chance at becoming a professional singer.
Lamb, Jack and Katherine take advantage of the phone tap in Savino's office and try to get evidence on how Savino works the skim, making District Attorney Reynolds very nervous. Meanwhile, Dixon and Yvonne arrive in Los Angeles to visit Violet at a movie studio, and Yvonne finally gets the chance to show off her beautiful singing voice at a big Hollywood party. Also, Mia is shocked when her presumed dead mother, Lena, arrives at the Savoy and sets her sights on Savino.
Sheriff Lamb needs to find a way to help his son when Katherine arrests Dixon after a bruised Violet accuses him of assaulting her. Meanwhile, Savino has his own problems when Lena finds a gambler's body in one of the Savoy's suites.
As Sheriff Lamb and Jack investigate the murder of a Savoy craps dealer, a desperate suspect in the case takes Mia hostage, demanding a ransom for his getaway. Meanwhile, Savino plots to play dirty with Gainsley when The Tumbleweed Casino reopens, and Yvonne questions her new relationship with Dixon when her ethnic background becomes an issue.
When Sheriff Lamb investigates the death of Porter Gainsely's attorney, it triggers retaliation attacks that puts Katherine in the hospital and leaves Lamb without a badge. Meanwhile, Sheriff Lamb also discovers new details that could reveal the truth behind his wife's untimely death.
Sheriff Lamb and Savino join forces to take out Porter Gainsley, the man responsible for putting Katherine in the hospital and who Lamb believes killed his wife. Meanwhile, Jack plans to propose to Mia.