Easiest way to write a summary of a book is to read the first chapter, a few of the middle chapters, a few pages here and there, and the last chapter. Summarize the book, and add little details you think might be important. What do you need help with specifically though?
You need to comment what it needs to be about.
Basic one:
She cries,
Tears roll down her eyes,
Shes a princess,
But has not found her crown.