I don't know if this is an horror or a thriller but I know it's very creepy and twisty.
You never know what will be next, you don't know if there's a rational explanation or it's paranormal.
You simply follow the plot and it kept me on the edge till the end.
There's a mystery but there's also the story of Jessica and both works well together.
The idea of people who is killing according to a book plot is not new but the author did an excellent job in using this trope.
Highly entertaining and gripping.
Highly recommended.
Many thanks to the publisher and Netgalley for this ARC, all opinions are mine