Cannon - Season 2 - Eps 11: Hear No Evil
Dale and Laura Corey are a happily married couple who own an electronics store; he does a lot of electronic eavesdropping for clients, she was a cop on the force with Cannon a few years back, and hires him because Dale is being threatened after bugging some hotel rooms for the owner.
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