Inversion of Word Order for Emphasis
Inversion can be used to form questions and conditional sentences, but it can also be used for emphasis.
Littledid she know how much work was left. On no accountmust you sleep at school. Nevershould you forget who your boss is. Only thencan you belong to me. Herecomes the sun.
All these structure are rather literary, which means they are more likely to appear in books.