I think we did a great job of putting together a program that would have made good e-books available had people been buying e-books in any real numbers.
But at the same time, the commonplace statement about them is true: every character is the hero of his own story. Each has a justification for his actions that is convincing to him. It's fun to give these people voices.
I don't think the problem is that people don't read enough mystery books, but that people don't read.