Friday (Jack Webb) and Smith (Ben Alexander) team up with a fire marshal to determine the cause of several recent house fires. Evidence indicates that the houses were torched by a burglar--who steals only inexpensive or worthless items. What can be behind the burglar's MO...and what is he really hoping to gain? This episode was adapted from the Dragnet radio broadcast of November 9, 1954. ~ Hal Erickson, Rovi