The Road to Gundagai (The Matilda Saga #3)
Jackie French, Edwina Wren

And somewhere a murderer is waiting … to strike again.
This third book in the Waltz for Matilda saga is set in 1932, at the height of the Depression. Miss Matilda is still running Drinkwater Station, but has put aside her own tragedy to help those suffering in tough economic times and Joey, from The Girl from Snowy River, uses his new medical skills to solve a mystery.