Do you think you write your own clues without knowing it?
So in one of my next books, there's going to be a necklace found at memorial shrine for a missing girl. A necklace that the girl was wearing. I had written that it was going to be a cross strung on a black cord, but I realized I wanted it to have a snapped link.
And then I realized I had already given the girl an iconic necklace - an amethyst on a silver chain - earlier on. It was like my mind was working subconsciously on the problem all along. And it just needed me to catch up.
Have you ever done that - realized something was in your manuscript all along?