The Flying Doctors (1986)

Season 1: Episode 22

A girl named Sarah is alone at her and her husband's property when he is off working. She claims she hears someone spying on her and involves as well Jack as Geoff. Finally she sees someone in a window and fires a shotgun. Jack and Dougie traces, it turns out to be one of Sarah's work-friends, who wanted to make sure she was safe all alone out there. Kate is seeing George Baxter but when she finds him with another woman in Broken Hill she quickly ends their relaionship.