Randall and Hopkirk (Deceased) (1969)

S1E23 The Trouble with Women

Jeff is approached by a woman who orchestrates a plot for her husband's assassination. Undercover, she manipulates Randall's trust while entangled with her secret lover, who owns a club. This dangerous game nearly results in Randall being shot at a remote quarry, as the web of betrayal tightens around them.