I'm not saying it's Partridge, I just picked him because I had to.
I think at the end of the episode when Patrick said, "Now I have leverage," he knows who killed her, knows it isn't Red John, and knows it's someone from the Tyger, Tyger club. PJ obviously knows waaaaaaaay much more than he is leading on and is a smart cookie, so he would know that RJ wouldn't have some lazy PI plant a bug in the office when he's been getting info all along.
PJ knows what's going on or he wouldn't have said "leverage," he would've used a different choice or words for that.
I can't wait until next week!
