While I don't have a favourite book, I'm currently reading The Poisonwood Bible by Barbara Kingsolver which I recommend. Flowers for Algernon, Room, The Alchemist, Gone Girl & Half of a Yellow Sun aren't bad either.
I'm currently reading The Wars of Alexander's Successors 323 - 281 BC: Commanders and Campaigns v. 1 by Bob Bennett and Mike Roberts.
Its really interesting because not many people know what happened after Alexander died. What happened after he died is just as fascinating or even more than whilst he was alive. Also, its kinda like GoT if you like that.