The roaring twenties are in full swing.

Chicago's hottest up-and-coming jazz musician, Robert Callum, and his band, the Windy City Rhythm Kings, keep the flapper girls swinging every night at the Green Mill. A world away, in Kerry Patch, St. Louis' poor Irish neighborhood, Daniella embraces the humble culture of her adoptive family while striving to establish a new identity for herself and, simultaneously, hoping to bury the secrets of her scandalous past.

Nearly two years after they parted ways, Robert and Daniella cross paths by chance and, suddenly, a tidal wave of betrayal is upturned, threatening both of their lives as they know it. Robert's boss, Jack "Machine Gun" McGurn, a dangerous gangster who deals in gambling, alcohol, and murder, meets Daniella and, soon, his passionate desire for the beautiful and young coquette flares into an alarming obsession. Without warning, she is caught between these two men, their jealousy, anger and power creating a deadly storm. To make matters worse, gangster wars rage in the streets of Chicago, and Daniella's new beau's involvement in the crime world puts her future - and a host of other's - in jeopardy.

Robert knows the dark secrets both Jack and Daniella are keeping from one another - but will he use this knowledge to tear them apart? In his attempt to keep Daniella for himself, will Jack's violence go over the edge? Will Daniella's disgraceful behavior get her disavowed from her wholesome family?

Mobtown Player is the third novel in The River Series quadrilogy. It follows Bordertown Gypsy and Lynchtown Wolf and precedes Rivertown Crooner.