[Content Writer] where would I find someone for a specific book?

I'm looking for a content writer that can write a few reviews for different books in a series.

I've tried looking on a few communities for people that like this book series, and have messaged a few people but haven't found anyone interested yet. Is this something a content writer could do? or do they mainly focus on general knowledge/niches to write content for?

does anyone know a better freelancer type website to find someone that could do this?

What book series is it? I can't PM yet or I would.

I could give it a try, I can write a quick review on the matter and if you like my style, we can extend the business

It all depends on if someone's read the books. Try a forum that has a large book-reading audience and you'll be able to find someone good (presuming you're paying a decent amount).

go to odesk and search for contractors who have a good feedback in submitting reviews for books.