I'm not sure specifically as I haven't read it. But it might be about some kind of mystery or emotional journey related to the eyes and the concept of darkness.
Since the title mentions 'the eyes' and 'darkness', it might be about a person who has seen something in the dark that has changed them. It could be a supernatural event, like seeing a ghost in the dark, or it could be a more realistic situation such as witnessing a crime at night. The 'novel' part implies that it's a fictional story that will likely explore these themes in detail, with characters whose lives are affected by whatever this 'eyes have darkness' situation is.
Well, perhaps it could be a story where the eyes are a symbol. Maybe the 'darkness' in the title refers to a character's inner turmoil or a dark secret that is somehow revealed through the eyes. It could be a psychological thriller or a deep, character - driven drama.