Granted I don't do many readings, but I do think it's important to look not just at the cards as individuals, but the mood of the cards as a whole--a reading which was that closely focused on what you wanted it to address isn't going to wander so dramatically at the end, I don't think. It's more likely that you simply haven't figured out what the card is refering to.

I predict within a week you will sit bolt upright in bed as you try to fall asleep and say, "of course!" I mean, heck, it could be as simple as the plot of the book isn't going to go where you want it to go, and thus you have writer's block as you try and force it to fit. (okay, I may be projecting there. :)