Upon a re-read of the book, and analyzing the events that follow, I think I may have figured out 95% of what was going on in Proven Guilty.
To begin, we need to understand the Black Council/ Nemesis' objectives in this book. As I see it, they had 4 plans which were enacted more or less simultaneously:
- Attack the White Council children's camp as well as a Venatori stronghold in Oregon through the Red Court. The objective was to draw in members of the Senior Council such as Ebenezer, Injun Joe & Martha Liberty, and then ambush them with Outsiders.
- Ebenezer points out to Harry early in the book that if it weren't for allies like the Venatori, the White Council would have fallen a while ago. By attacking the stronghold, the Black Council would cripple one of the White Council's biggest allies
- By killing members of the Senior Council, the Black Council would remove serious obstacles as well as create new openings on the Senior Council that they can fill with their allies. This ploy is the premise of Turn Coat later on.
- Attack Arctis Tor, depose Mab & replace her with a Nfected Maeve.
- My theory is that Maeve convinced Mab that Lily, like Aurora, had been Nfected. This caused Mab to amass her spare troops at the border with Summer instead of retaliating against the RCV for trespassing the previous year
- This leaves Mab relatively undefended at Arctis Tor for the time being, allowing the Black Council to summon their allies & successfully breach the gates at Arctis Tor. Mab however is able to escape by hiding as a statue in her prison/garden
- Set up SplatterCon!!! to keep Harry & Michael busy in Chicago
- Madrigal Raith confirms that the conference was set up at least a year ago when he was invited to attend (and be the scapegoat)
- I believe the Black Council used Mavra, disguised as Sandra Marling to set up the Con. Mavra does this to get revenge on both Harry & Michael (through Molly). This is also supposed to keep them busy as the Black Council's other plans unfold
- I posited earlier that Maeve convinces Mab that Lily is Nfected - as a result Mab decides to replace Lily with Molly, who she knows is not Nfected. Note: At the end of Cold Days, Mab mentions to Harry that she originally considered Molly to be a better candidate for Summer
- As a result, the Black Council decides to Nfect Molly, turning her a sleeper agent. To help prepare Molly get Nfected, the Black Council uses its' agent Sandra Marling to begin pushing Molly towards dark magic. The resulting taint on her soul would allow Nfection to take place.
- After the attack on Arctis Tor, despite successfully breaching the security, the Black Council is unable to locate Mab. Realizing the extent of the Black Council's plan, Mab is able to get Eldest Fetch to abduct Molly - taking her away from the clutches of the Black Council, and bringing in Harry to save the day.
- The Black Council is happy to send Lily to aid Harry in "rescuing" Molly because they do not want Mab to have her before the Nfection. By using Lily's butterfly in Arctis Tor, Maeve is able to further the fiction that Lily is Nfected, allowing Mab to think that Lily planned the attack. Mab sees through this & realizes that Maeve is the one who is actually Nfected
So in essence, 2 things spoil Nemesis' plans - Michael goes to Oregon instead of staying in Chicago & helping Molly; and Mab is able to successfully hide during the attack on Arctis Tor - the unsuccessful attempt unmasks Maeve. This book is the beginning of the end of the war against the Red Court - it is the first time that the Black Council are unable to achieve
any of their objectives.
I also believe that it is Future Harry who creates the accident with the Beetle in the beginning of the book - this forces Harry to rely on Murphy & Thomas, both of those help he needs to get through the case. He also fixes Little Chicago as he alone knows Harry's wards at this time.