Can I have a story inside a story (read description)?
A girl, the main character, is told to read a book, which she does. It tells the backstory of the main villain, which his name is also the title of the book. The part about it being a backstory is unknown at the time, she thinks that it was just an ordinary storybook. I plan that it will begin on a new chapter. So the final sentence of he last chapter will be something like, "she picked up the book and read it". The story won't be too long, maybe 2-3 chapters. After the backstory part is finished, the story will continue from where it left off.
The backstory itself is a sad story and it is vital for the girl to know the main villain, his capabilities, his actions and why he acted like that (or else he might kill her easily).
Has this been done before, and can I do it? Or it will be too distracting for the audience, having a story in a story?