When I started reading this, I noticed early on that the protagonist interested me. He wasn't a character that I particularly liked, or identified with, but he interested me, intrigued me, and I felt some sympathy towards him. My first impression was that this protagonist was a lonely person, an unhappy person, and I wanted to know what he had experienced to make him feel that way. As I continued reading, I began to wonder whether his situation could have been different, and if he lived an isolated life with not many friends or acquaintances, perhaps that was his own choice. I never made up my mind, but I feel it's something that's open to interpretation. One thing I was certain of, was that this character had questions he felt needed to be answered.
I felt that the protagonist talked to the reader in a very thought-provoking way. For example, "What one wants and what one gets is rarely the same". A simple statement like that has an impact because I find that as a reader, you accept it as a true statement, a fact, that relates to your own life, at least on some level.
Something else that unfound interesting about this book was its ambiguity. There was a moment when it was suggested that the protagonist was, in fact, not who he believed himself to be, but someone else. As a reader, I felt affected by that, and had to continue reading because I found it necessary to learn the truth. This is one example of why I found the book quite psychological, something that has the reader asking questions.
The chapters were short, so for that reason, it seemed necessary to read a few chapters all at once. The conclusion of the story was something that I hadn't anticipated, and it was again ambiguous. Another factor that I felt made this book a psychological thriller. I like psychological thrillers.