I am having trouble remembering a book I must have read about 5 years ago.
The book was written within the last 20 years I think.
The defining plot point I am looking for is:
A young (young adult, or 19+ ish?) wizard (Some sort of apprentice?) is charged by a much more senior Wizard with sorting their library. I seem to remember that the senior Wizard was not terribly pleased with having an apprentice forced upon him and was giving him "busy work".
The student is pretty much a troublesome prodigy that his school (?) needed to get rid of, so he was sent off elsewhere.
While sorting through the books, the apprentice comes upon a tome that he identifies as magically protected by a trap (through runes?). He is (unexpectedly) able to disarm the trapped book, and gains access to some sort of forgotten history, diary, or knowledge (?).
I don't remember much else about the story as a whole, but the scene is quite vivid in my head. The library is described as complete chaos, with books piled everywhere.
The world is one where magic is pretty commonplace, and can range from mundane to world-shattering.
The Senior Wizard's library is located in his tower, which is isolated and I believe described as a "typical" fantasy wizard tower.