Cannon - Season 1 - Eps 17: Blood On the Vine
Mike Tampa, a vineyard owner in northern California, has been the victim of three murder attempts. After the third attempt, his secretary calls on Cannon, secretly, because Mike has stubbornly refused to do anything.
About Cannon

Title: Cannon
First Air Date: 1971-09-14
Last Air Date: 1976-03-03
Status: Ended
Rating: 6.4/10 (from 34 votes)
Language: EN
Seasons: 6
Total Episodes: 123
Network: CBS
Genres: Drama, Action & Adventure
Production Companies: Quinn Martin Productions (QM)
Synopsis
Cannon is a CBS detective television series produced by Quinn Martin which aired from March 26, 1971 to March 3, 1976. The primary protagonist is the title character, private detective Frank Cannon, played by William Conrad. He also appeared on two episodes of Barnaby Jones. Cannon is the first Quinn Martin-produced series to be aired on a network other than ABC. A "revival" television film, The Return of Frank Cannon, was aired on November 1, 1980. In total, there were 124 episodes.
Cast

William Conrad
Frank Cannon