'Shantaram' is a fictional book. It has fictional characters and a fictional storyline. It may have some elements that seem real - life - inspired, but overall it's a work of fiction.
It's fiction. The story in 'The Shack' is made up by the author. It contains elements like a special place (the shack) and interactions that are more in the realm of imagination. It might touch on real - life themes like faith and relationships, but the overall story is fictional.
Whether 'Citizen' is fictional or not really varies. If it's a novel or a work of imagination, then it's likely fictional. But if it's a non-fiction account or biography, it might not be. So, it all comes down to the nature and genre of the book.