Andy is a bully from the start of the books and an all around jerk. He is (for quite some time) Mark's bully until he gets into reading Bobby's journals. Andy forces Mark to let him read the rest of Bobby's journals after he one day comes across a page of Bobby's journal that Mark had misplaced. Things start to get weirder when Andy joins Sci-Clops (the science club which Mark is in) and makes tremendous improvement. This event leads us to think that Andy is not who he really is. Towards the end of The Rivers of Zadaa, Andy takes an odd turn and ends up helping Mark in order to rescue Courtney. In the very end of the book it ends with a cliffhanger in which Andy is revealed to supposedly be Saint Dane. This was confirmed in The Quillan Games.