Tirole's book is the most popular one for PhD level, if you really want another book, have a look at Titman's Financial Markets & Corporate Strategy, which is not as theoretical as Tirole's.
or, you may interested in an old book by Fama, "The Theory of Finance", which can be download from Fama's website http://faculty.chicagobooth.edu/eugene.fama/research/index.htm
BTW, I'm also a student, my point may be not right.