When did I know?

To be honest, I had no idea who the culprit was in Proven Guilty for much of the novel. However, i started getting some clues and piecing it together towards the end. My first clue that Molly had something to do with the monster attacks was when Dresden followed the trail of the phages right to the Carpenters' house after escaping the Scarecrow. I remembered from earlier that Dresden had cast a spell to send the phages right back to their summoner at the convention. When he followed the phages' trail to Molly's house, Dresden was shocked that he had somehow sent the phages to Molly, and the fact that his spell sent them to her gave me a clue that she had something to do with it. Also, the fact that Molly was able to fight the Reaper off of her brother by just hitting him with a bat was a little strange to me, because those phages were supposed to be really strong and even hard for Dresden to fight off. Then I started thinking about how the monsters just picked Molly up and carried her away instead of harming or killing her right on the spot, which was what they did to every other person they came in contact with previously. These phages are supposed to be brutal killing machines, and they just picked Molly up and kidnapped her? That seemed a bit out of character for the phages. Combining all these clues, it became clear to me that something wasn't right about Molly Carpenter.