The Blackstone Chronicles is a serialized novel by American horror and suspense author John Saul. The series consists of six installments and takes place in a fictional New Hampshire town called Blackstone. The series has been adapted into both a computer game and graphic novel.

Based on that paragraph can we conclude that this sentence is true?
John was a writer of horror based fiction writing

Available options:
[I] Yes;
[II] It's impossible to say;
[III] No;