Inverted syntax: 
Reversing the normal word order of a sentence

Examples:
“Something there is that doesn’t love a wall”.
-Robert Frost, The Mending Wall

Explanation:
Frost has this in the beginning of the poem to create a mysterious beginning. The purpose of this mysterious first sentence makes the reader question what is happening. Frost begins the poem with a troubling question of what is destroying the wall every year, which is also the theme and purpose of the poem itself. This inverted syntax helps set the tone and makes the reader interested in the poem, which is any authors purpose for their work.