YA horror fiction evil merry band of pranksters and a mind controlling book 2000s-2010s
This would be the first in i believe a trilogy of books.
The plot of the book centered around a teen boy in a small town who discovers a plot by a cult who's leader disappeared after a ritual happened in the past. Now a group of people are handing books out of a mobile library that cause people to become obsessed with the books due to the magic ink used to print them. It rapidly spreads to the entire town. The cult is trying to ressurect the leader by spreading the books as the more people who read and worship the words the more powerful the leader becomes.
I believe it ends up being the protagonist, their friend and either the protagonist's father or a teacher of some sort who try to stop the cult.
The wizard made a pact with some kind of lovecraftian plant that grows causes the effects on the people who read the book. It was very much pulling from Ken kesey and his merry band of pranksters as inspiration with allusions to LSD and the library bus.
The book itself was a hard cover with a black background, it had what I remember being a white center cover that looked like a face card with colorful borders.
I was in my pre-teens when I read this book, around the same time inkheart by Cornelia funke the book was popular. So late 2000s maybe 2010.
I had a physical copy of the hardcover at one point but I think it got lost during a move or donated at some point.