A retired law professor is murdered after warning the Bureau that La Cosa Nostra is gaining a toehold in large housing development. His death brings Erskine into the case. The dead man was Erskine's law school professor, who had encouraged Erskine to join the FBI. Three people saw the killer leave the law professor's home but decided not to go to the police. They think they're safe but a Cosa Nostra kingpin orders they be found and eliminated.
—Bill Koenig