Sure, it is. This book has the elements typically found in literary fiction like deep exploration of human emotions, sophisticated language, and a focus on character development.
First off, you need to analyze the plot development so far. Consider the conflicts and how they might resolve. Also, think about any foreshadowing and how that could play out. That way, you can form a reasonable prediction.
A 'nifty adult story' could be a story that is appealing to adults. It might have elements that are more relevant to an adult audience, such as stories about career challenges, family dynamics in adulthood, or self - discovery in later years. However, without more context, it's hard to define precisely.