Showing Flappers, Flasks and Foul Play (A Jazz Age Mystery #1) by Ellen Mansoor Collier

“Boardwalk Empire" meets "Downton Abbey" in this soft-boiled historical mystery, inspired by actual events. Named one of the "Best Beach Reads of 2013" on Goodreads.
Rival gangs fight over booze and bars during Prohibition in 1920s Galveston: the "Sin City of the Southwest." Jazz Cross, a 21-year-old society reporter, suspects foul play when a bank VP collapses at her half-brother Sammy's speakeasy. Was it an accident or a mob hit?

Soon handsome young Prohibition Agent James Burton raids the Oasis, threatening to shut it down if Sammy doesn't talk. Suspicious, he pursues Jazz, but despite her attraction she refuses to rat on Sammy. As turf wars escalate between two real-life rival gangs, Sammy is accused of murder. To find the killer, Jazz must risk her life and career, exposing the dark side of Galveston's glittering society.
See the new sequel: Bathing Beauties, Booze and Bullets, published in May, 2013.