The books vs the films

So I've finally got round to reading (listening but that doesnt matter) the books and I'm currently about 30 chapters into The Scorch Trials and for some reason it's actually making me angry how different the films are to the original source material in the books. The first film isn't too far off the book as such because it follows the same sort of story with the odd bit missing or added. BUT the second film is a completely different story all together?! I really enjoyed the film when I've watched it but I now look back and think wtf was that?! I'm very much hoping for a TV series reboot in the coming years because the films dont do it justice in the slightest and I guess they could get away with more in a series.