A small LA business district has been plague by a series of jewelry store holdups, in which the perpetrator violently assaults his victim. Working on the slimmest of leads, Friday (Jack Webb) and Smith (Ben Alexander) are finally able to determine that the criminal is carrying on an affair with a married woman. The bad guy makes the proverbial "One False Step" when he places a phone call to his paramour--with the cops listening in. This episode is based on the Dragnet radio broadcast of November 29, 1951. ~ Hal Erickson, Rovi