1x12 - The Flying Doctors

Tom and Gibbo has to land in the middle of nowhere after a clinicround. They come to an old cabin where they find a man and his dying mother. They also find the man's daugther Amanda who has lived there isolated in her whole life. When the old lady dies Tom promises to bring Amanda to town, but this upsets the man. He later comes into town to persuade Amanda to come back. She refuses and he kills himself.