The subject of today's file from your FBI... Homicide! In the solution of crime, the FBI makes use of every modern, scientific aid. But no instrument has, or will be, invented which can replace human intelligence and dogged determination. That constant alertness and proven skills of the special agent himself are the true basis for all investigations conducted. Without him, science would be helpless. Together, they form the combination which brings the criminal to inevitable justice, as in the case you are about to hear, where these two forces act in conjunction to ensure the arrest of a killer within a few hours of his crime!