The elements that keeps you most interested in a fictional book include
an unsolved mystery
a story based on historical events
a love story
an action-packed story
a story about the future
The most interesting part of a fictional book
All these components can be integral to a work of fiction, where the author constructs an imaginative world with a narrative recounted by a storyteller and experienced by fictional characters.
To clarify the difference between fiction and non-fiction, it's essential to note that news articles in newspapers fall under nonfiction narratives as they report real-world facts deserving of dissemination.
complete question
Which elements keep you most interested in a fictional book?
Check any that apply.
an unsolved mystery
a story based on historical events
a love story
an action-packed story
a story about the future