Read the book a while back but this is what I remember from it. Basically, after introducing the charactera and a that, it starts throwing possibility after possibility at the reader before abandoning most of them.
For example, a guy literally does the impossible, he was just a random drugee. Red Herrings as bad as this are basically every plot point from what I remember.
The only thing about ghost is thrown out of nowhere right before the end
Spoiler Territory about some plotpoints.
Protagonist friend is acting crazy and kind of as if the person was influenced by ghost, nope, the person just once knew that the person that is important was sent to the asylum by Grandpa.
A guy passes out and potentially does things in his sleep, such as assault, luring people to bad places. No ghost, he just as a illness that he knew about but didn't think to mention ever, even though he truly was baffled by what was happening.
Don't read this book unless you have low standards