It's a mix. The core of the story has roots in truth, but for the sake of entertainment and storytelling, certain aspects could be embellished or adapted.
It's most probably not a true story. Usually, such works draw from a combination of fictional concepts and maybe some loosely inspired events or themes, but not a direct account of reality.
It is indeed a true story. The book and subsequent adaptations draw from factual accounts and real-life circumstances to present a compelling narrative.
It's about a story that is based on real events. It likely involves the exploration of certain religious or cultural aspects within a particular community. Maybe it shows how people's beliefs and the society they are in interact and sometimes lead to complex situations.
It's a story that likely delves into some real - life events and issues. Maybe it's about a particular community or set of events that took place under the so - called 'banner of heaven'. Without more context, it's hard to say exactly.