I overall really enjoyed this series and it was a very fast pace. 
 But there are some things that bothered me. 
 One of them was how oblivious Kylie was. 
 Every single mystery in her life was clear from the begging! 
 But The main one was that even tho the story was really interesting and the author could have done so much more but, in every single one of these books nothing drastic happens until the very last 30 or so pages. 
 The villain of the story shows up at the end and kills some one and then promises he returnees later and he doesn't until the last pages of the next book in the series. 
 We don't see many things happen except the ever going question of "Derek or Lucas?" Which Kylie doesn't do anything to make her, make a choice. 
 And even the "Big Battle" in the last book is just 1,2 pages. The villain almost dies immediately. Very anticlimactic. 
 Great story idea, 
 Great characters, 
 Could be better written if focused more on the story instead of the ghosts.