The story about the dead jockey is pretty lame. The jockey was a legendary local figure, and the owner of the horse and stables that he rode for was also legendary.
As someone who should have money if she is running her own racing stables, supposedly she fixed the race so she could bet 150 Australian pounds (which is about $120 US dollars). Then she kills the jockey because he did not intentionally lose the race?
A horse lover who works at the stable is depicted as mentally disturbed due to her love for horses. Eventually she goes on a rampage by shooting at the various stable characters that she blames for a horse's death. That was a mean way to deal with a character who loved horses.
The worst is saved for Dr. Blake's wife. She arrived at his house at the end of the previous episode, after 17 years missing after World War II. Blake should have cared for his wife, considering all the times he was seen suffering about her fate in previous episodes.
Blake runs a lodge for guests / tenants, so giving his wife a room and taking care of her basic needs should have been a given. They should have immediately contacted their mutual daughter and aranged for a reunion. The story should have been about helping his wife feel she had a family.
Instead, the story focuses on how uncomfortable Blake and Ms. Beasly are due to May Ling's return. A gigantic fail. What seems like a day or two later, May Ling tells Blake she understands what a problem she is, and she will go stay at a hotel.
What a pathetic character Blake is to accept that, considering that he is renting rooms to lodgers. May Ling should have been treated like a welcome member of his family. She spends 17 years looking for her family, and all she finds is the incredibly shallow and selfish Dr. Blake and Ms. Beasley.
So Blake takes May Ling to a hotel to be by herself, so that Blake and Beasly can feel less uncomfortable that she is alive and that she is in town. I feel like both of them are very shallow and trashy characters after this episode. He is an alcoholic and she is his enabling secretary / girlfriend.