[The Australian Panther]

How to write one of these.
Enter Heroine, who is always on her own in some way. Something iuntoward is going on, which is unknown to most of the people in the story. There is a mystery. Often an innocent person, maybe our heroine, is accused and their innocence must be proved.
The villains keep on doing nastier and nastier things, but its always darkest toward the dawn. The heroine reveals the truth and reveals the real villain. Happy ending.
Smiles all around.
What is most curious to me is the prevalence of Children, males and females, at 'Public Schools' [?] who are wards who have guardians but not parents, or have Mysterious Uncles or Aunts that live in foreign countries or Islands or mansions, but who are unknown to them until the story starts.
Its obviously a formula and a very definite one, and it works, and I just wonder where it came from?

Link to the book: Schoolgirls' Picture Library 049 - Loyal to The Co-ed Outcast