Review Detail of Kage in The Great Thief

I generally give novels a chance, but it would be very hard for me to give this novel anything more then 2-3 overall stars. One of the main things that annoys me is during the times the story goes from one part to another without a transition leaving me (the reader) confused and trying to understand what happened. I also find the story and character development lacking. The author automatically assumes that the reader will have a tactile understanding of specific parts of the setting as well as the character without at the least explaining why or how it came to be. Lastly, I find it hard to believe that the main character is all of a sudden an expert with the thief class when that was not his main in the past and eve harder to believe that he is able to master it on manual. The author does not even try and give an explanation on it.