The Briggs and Jones Mysteries
Is Betty, Hasting's secretary, Betty Briggs?
Mister C. (Bad Cooper) is after Hasting's secretary. He sends Ray to see her, and find the "coordinates". There's something with "her car", too.
UPDATE : That theory probably doesn't work, with new scenes in Part 9. We see Betty alive, and we learn that Betty (Hasting's secretary) is dead.
In The secret history of Twin Peaks, Major Briggs understands that Cooper is Bob. Did he gave informations to his wife Betty?
Mister C. shows that symbol to Darya, saying that's what he is looking for:
Is that the owl cave ring? Did Major Briggs gave the Owl Cave Ring to Dougie Jones to hide it from Bad Cooper?
What is the link between Garland Briggs and Dougie Jones?
After the discovery of Garland Briggs body, Buckhorn investigators find Dougie Jones wedding ring inside Garland Briggs body... How did they knew each others?
In Part 7, we learn there is a "Jones" family in Twin Peaks. Is Dougie Jones from Twin Peaks and knew Garland Briggs?
In Part 4, Bobby Briggs is intrigued when he ears about Cooper. He says that his father was the last one to see Cooper alive, before Garland died in the fire at his station. Bobby mentions his mom Betty, who saw Cooper talking to Garland:
But when Frank Truman asks if Bobby knows what they talked about, Bobby says no - but the way Dana Ashbrooks acts at this moment, he could be lying. Does Bobby knows something about Cooper's Doppelganger? He says "Uh, no, I've no idea", shaking his head too much, and then looks at Laura's portrait.
First time we see Betty Briggs in the Pilot from Season 1. "9-1-1" and a Tibetan Monk!