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When a girl is found murdered and numbered
'one', McGarrett suspects a serial killer. However the killer seems to be very selective in targeting members of a particular company, and suspicion soon falls on two brothers who stand to inherit the firm from their aged aunt.
First Air Date : Sep 20, 1968
Last Air date : Apr 05, 1980
Episode : 284 Episode
Season : 12 Season
Runtime: 60:14 minutes
Studio: CBS
Country: United States of America