Unfortunately, by the third novel in the Mr Mercedes series, Stephen King is squarely back to the bloody paranormal.
The only way to make the paranormal work in a novel is to have it serve some interesting purpose. Colleen Hoover managed to do that in Layla, and even I didn’t hate the paranormal aspect of the book. But King, like almost everybody who does the paranormal, uses it out of laziness.
How did the mass killer escape from the secure facility where he’s held in a vegetative state? You could come up with an inventive plot or you can simply say that the killer suddenly develops the powers of mind control and inhabits the brain of whomever he chooses. Ta-da!
The problem is, where anything is possible, nothing is interesting. How did the criminal do this? Magic! And how did he… Also magic! But how… Really cool magic! Ah, OK, then.
The series started strong but then kind of petered out. The first book is good, though.