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Inspector Erskine (Efrem Zimbalist Jr.) gets to show off his tennis prowess when he goes undercover to end the criminal activities of suave racketeer John Harris (Joseph Campanella). The elusive Harris has ordered the killing of a Federal agent, and Erskine hopes to trap the man into incriminating himself. Meanwhile, Harris' paid assassin prepares to eliminate the only witness to the killing, a lonely teenage girl named Barbara (Brooke Bundy). Featured in a villainous role is future Hill Street Blues star Daniel J. Travanti, here billed as "Dan Travanty."