Finding out 'who did it' at the end of a mystery novel

1. I could see it right from the beginning.
2. I suspected as much.
3. It finally dawned on me.
4. That explains everything!
5. That’s it, in a nutshell.
6. It was the missing link.
7. Just put two and two together, and it all makes sense.
8. I saw it coming, because though it didn’t seem so at first, in retrospect it was a dead give away.
9. It will do it to you every time.
10. It was on the tip of my tongue all along.
11. That never would have occurred to me.
12. I don’t know why that didn’t occur to me.

Finding out 'who did it' at the end of a mystery novel