Akim Tamiroff, Paramount Pictures' resident crime lord, runs all illegal gambling activities in a major city. Reporter Lloyd Nolan struggles to get the goods on Tamiroff, but runs up against a stone wall until he meets nightclub singer Claire Trevor. Trevor is anxious to avenge the death of her sister (Helen Burgess), who was done in by Tamiroff's minions. Though only a "B" picture, King of Gamblers was given "A" treatment by director Robert Florey. The film was part of an unofficial Paramount series based on the J. Edgar Hoover book Persons in Hiding. ~ Hal Erickson, Rovi