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Duet was a Fox sitcom (April 19, 1987 - August 20, 1989) starring Matthew Laurance as Ben Coleman, Mary Page Keller as Laura Kelly, Chris Lemmon as Richard Phillips, and Alison LaPlaca as Linda Phillips.
Ben was a struggling mystery novelist and his girlfriend Laura was a caterer with her younger sister Jane (Jodi Thelen).
By the time Duet left the air, LaPlaca was its breakout star, and took the lead in its spinoff, Open House.