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Industrial espionage is a problem at Hartoy company. When the investigator Jonathan has hired is murdered, the Harts go undercover in an attempt to foil the crooks and save the company from financial destruction.
First Air Date : Sep 22, 1979
Last Air date : May 22, 1984
Episode : 110 Episode
Season : 5 Season
Runtime: 60:14 minutes
Studio: ABC
Country: United States of America