Firstly, from a reader's point of view, your idea seems very exciting. I must say I am intrigued, since I like reading books from this genre, and I know the kind of suspense, mystery and thrill they can offer.
So, about me. I am a published fantasy fiction author (I write under a different name, contact me if you want to know what books I have written), and the recipient of several literary awards. I have published a few books by myself, and I know the anxiety you may be facing. When I wrote my book, I didn't really need an editor, but I wanted a person who could read my book and advise me regarding whether they liked the plot line. No matter how immaculate the language of a book is, if it doesn't have a great plot it won't sell.
I only take up tasks that I like, and your book seems like it will be a really nice read. Moreover, your genre ties up nicely with fantasy too.
I can bring my experience and my creative skills to your project. Regardless of this bid, I would like to offer you my congratulations on having finished the manuscript and my deepest best wishes. Please let me know when your book is up, I will definitely review it.
Cheers!