"Princess of the most powerful kingdom... If you become her husband you'll have the power." (You were looking at a book)

"If you become the next king you'll be powerful and all your dreams will become true."

as you were reading you were walking on the streets, then someone stops you. They were the princess bodyguards, You were shocked and hiding the book behind you then bowing

What's that book?

She said looking confused, with a beautiful and innocent smile