I only ever read one, and all I remember of that was some kids being chased into a church by some demons, who then burn it down to get to them. The kids are put on trial for "forcing" the demons to burn the church, and they have to convince their lawyer not to throw the case because he'll be executed if he wins.
Weird, I guess he claims ghostwriters only assisted him with making outlines, but unless he had Steven King level of cocaine addiction idk how he was able to churn out that much so quickly. I haven't read any of them since I was a kid, though. The dummy episodes gave me horrific nightmares.