Book #4 check in 2

I am reading Miss Peregrine's home for peculiar children. This book started off really slow but it has gotten a lot better. The main character, Jacob, has met some of the children his grandpa used to talk to him about and the adventure he is going on has become more exciting. His father, which I said was the antagonist, has not been in the book much since, so he has not been discouraging Jacob as much as he was towards the beginning. The book is moving faster mainly because of a major event that occurred and now Jacob is trying to get all of the answers he possibly can. This book feels strange to me and I don't really know how to explain it but it seems a bit childish. I think this book is more for middle school aged kids because of how its written. I just feel like it is not like other books I have read recently and it sort of seems like the author is dragging the book on with unnecessary child-like details. So far I tolerate this book, but I am not seeing the reason it has been on the best sellers list for so long.