A demon in my mind (A last kid on earth AU)

After the events of book 3 Jack starts to act weird. At first everyone though it was connected to Jack almost dying, but the he starts to keep a big secret that nobody ever has to know or the scale of good and evil may be tipping to the dark side. Join the main cast of the last kids on earth series as they try to help Jack and figure out what he's hiding. Also join them in fighting a new villain that doesn't seem human nor monster along with old villains too.

I do not own the last kids on earth franchise. This is an AU and is based on what I think would be fun for the story. I have a very bad posting ethic so the chapters will come out slowly, but i hope you like it.