I recently been reading the Harry Potter books as I never made it as far as the first one and being that the movies are coming to a close and the summer is quite boring I began reading them from start to finish. I just finished Half-Blood Prince (with timely manner as the movie will be out soon). But the more I read my thoughts continue to o back to the third book (Prisoner of Azakaban). This book is the most useless book in the series. Here's a few notes:

The book does nothing to move the overall plot of the series other then tell who betrayed Harry's parents to Voldmort. If I remember correctly it's told to you later anyway and it's a small part of the book as it is.

The other big part to this story is time travel. I'm no expert in the field but I love solving these kind of puzzles. To begin with time travel is always a tricky thing to do in stories. With all the rule you have to follow. First off there are two types of time travel.

Static- Meaning that if you went back in time anything you do has already been done and as such things will happen just as they did and no intervention can change it.

Dynamic- Meaning that anything you do in the past of the affected time will change the future. This includes every, little, thing.

But Prisoner of Azakaban follows both rules. Such as if the events that take place at the beginning of the book had an alternate version of Harry and Hermine in the background that went back in time then we can assume that they failed because they just had to go back in time anyway later in the book. At this point it leans on static but the fact that they did it in a time in which that were already in means that the cycle is messed up.

This is my last compliant. Why the hell didn't Voldmort's follows use a Time Turners to prevent him from the events that happened in the past? Also on the other hand the good magic folk could have used it during the 10 years that Voldmort was in power went back in time and killed him before it accrued?

See, one big hole in the universe.