If there is one thing I, as a reader, hate, it's being misled by the author. If I'm led to believe that the story will be a funny one, I want a funny one, not one that turns into a tragedy. If I'm reading a book that I've been led to believe will be romantic, I don't want it to turn into a thriller. If I were in the mood for a thriller, that's what I'd have picked up to read.
But as a writer, I'm afraid I'm doing exactly that with A Troll Wife's Tale. I mean the premise of the story (a female troll that becomes a tooth fairy) sounds like it will be a funny story. And it's possible that I may be able to have some funny moments in it (though as the quote goes, "dying is easy, comedy is hard", so I don't have high aspirations in the comedy portions of the story). But the general tone of the book is going to be darker, with (hopefully) scary stuff, and some real character development as the Troll Wife sees so much of herself in the Oubliette, and then decides how to resist becoming more like her.
Unfortunately, I don't know how to change this. I like some humor mixed with my thrillers (probably why I love Dean Koontz), but I don't know if I'm doing it right. I guess it's one more think to chalk up on my "to do" editing list.