I was simply going through the Harry Potter Book Four..?

stephen was good. michael crichton, even. but no one has ever intrigued my curiosity as thi rowling woman did. she's astoundingly goo. so, as i am simply finfishing the fourth book, this certain page after 674 simply banished all the mysteries bulking inside of me,and guess what -- it read page 649. yes, i was fooled, the book was a scrap. damned all the spoilers, and i supposed i was-- er.. nonplussed down to the tip of muggle born teeny brain. can you please give me one good summary of the chapter 34-- was it?-- the one titled veritaserum?and why was the prior chapter called priori incantatem? i understand all the way the other chapter title, but no one used the priori incantatem spell in that chapter, i suppose it is the one which would perform the last spell casted from a wand; this is moot. please give me feedback.please.