Conquering the messy middle

 As you might guess, I am in the middle of my latest Inspector Green novel, at about the halfway mark of the first draft, and I am floundering around. Not for want of story ideas but from too any. After starting off my writing career as a pantser (from the "let's dive in and see where this goes" school) I have gradually, over the course of about twenty books, become a "modified pantser". By