Making non-fiction into...boring fiction

Oh my.  Now, I wasn't expected to be blown away by The Hangman in the Mirror by Kate Cayley, yet I was still underwhelmed.  I liked the premis; I really did. The problem, though, was that I saw the ending coming so quickly that it didn't hold my interest. I know it was based on a real event, but Ms. Cayley could have made the reveal a little sneakier, don't you think?  It is hard to be invested in the middle fluff that is draggin the story to its obvious end. My advice? Cut the fluff and keep the story moving. That way, the ending might still be obvious, but it won't be so difficult to slog through to get there.