did Clare fall down the stares on purpose or did Irene push her?
Sounds okay... but I'm not familiar with the story. The answer is not obvious, is it? If it is obvious, it won't make a good essay.
That's some good advice from Byamba, but I want to add another suggestion:
Write the intro last!
One essay = one big idea.
one paragraph = one smaller idea.
Write the body paragraphs. They contain the 3 or 4 ideas that all mash together into your main idea. Know what I mean?
You have to write a paragraph about each of the ideas expressed in the essay, one paragraph=one idea, and then you will know WHAT YOU ARE SAYING. You will know your message.
Only then will you be ready to introduce it.
:-)