Friday (Joe Friday) and Smith (Ben Alexander) investigate when the body of 21-year-old Helen Corday, who has been bludgeoned to death with a tire iron, is found in a vacant lot. Unfortunately, the only clue is the footprint of a very popular brand of tennis shoe. After several dead-end interrogations and dozens of false leads, the detectives arrest Frank Larson (Stacy Harris), who has been caught in the act of attack a young babysitter. Even so, there isn't quite enough proof to put the noose around Larson's neck---obliging Joe and Frank to indulge in a neat bit of psychological warfare. This episode is based on one of the earliest Dragnet radio broadcasts, originally heard on July 7, 1949. ~ Hal Erickson, Rovi