Mechanical Orange

A dystopia where violence and state control collide. Brutally. The story is narrated by Alex: a sociopath and leader of a gang that terrorises the city with acts of extreme violence (nadsat). After being captured, Alex is subjected to a state-mandated psychological rehabilitation process designed to "cure" criminals. To "make" them good people, in fact.

The work questions free will, morality and the role of power.
Nothing too current, then. 

As for the reading experience, it is unconventional, featuring an Anglo-Russian dialect created by the author (nadsat). It took me a good 20 pages to get into the rhythm. 

We describe the world with the words we have. To describe that world, words were needed that did not yet exist in the 1960s. Many of them stuck with me.

Anthony Burgess (1917–1993) was a writer, composer, critic and linguist. He wrote dozens of works in various genres, but it was with A Clockwork Orange that he achieved worldwide fame. He was uncomfortable with it. He considered this book just one more of many literary experiments.

It has often been interpreted as an apologia for violence.
Perhaps it is (that's not how I read it).

That is why it is important.