"Sin City Secrets: The Mobsters Who Shaped Las Vegas" delves into the intricate relationship between organized crime and the development of Las Vegas, revealing how mobsters influenced the city's transformation into a gambling mecca. The book is structured in five parts, each chronicling different eras of mob involvement in Las Vegas from the 1920s to the present day. Part 1 explores the origins of organized crime during Prohibition, highlighting figures like Bugsy Siegel and Virginia Hill, who played pivotal roles in establishing criminal networks that would later target Las Vegas.

In Part 2, the narrative shifts to the legalization of gambling in Nevada and Siegel's ambitious vision for the Flamingo Hotel, which ultimately faced financial turmoil and led to his assassination.

Part 3 discusses how after Siegel's death, the Chicago Outfit took control of Las Vegas casinos, implementing skimming operations that siphoned millions while maintaining a façade of legitimacy through entertainers like Frank Sinatra.

The focus then moves to law enforcement efforts in Part 4, detailing significant crackdowns on mob activities and high-profile scandals such as those involving Tony Spilotro.

Finally, Part 5 examines the transition from mob influence to corporate control in Las Vegas during the 1990s and beyond. This comprehensive account highlights key historical events and provides insights into how organized crime shaped modern-day Las Vegas as an entertainment powerhouse.