I just finished chapter 4 again;
Cathy Cluck Suspects, the following have opportunity but the motive isn’t clear;
Quinn - Playing chess.
Nick - In the Library, where Rusty found the laptop.
Cathy Cluck Suspects, the following have opportunity and a motive
Tommy - to oust Rusty, become the president, freed up to deal with Quinn. I don’t think it’s him.
JohnBoy/ Elena - for Tommy/ Quinn / drugs probably not enough motive.
Heather - would of had access, was only concerned about Tommy, done so She is dating the President not VP. I don’t trust her.
Riona or Camilla (both) - On Quinn’s orders, Quinn wants a distraction to get in the DIKs safe. Nick tells us Rusty was fucking, we know Camilla had left Mona. So, Camilla fucks Rusty, Riona nabs the laptop and takes it to the library to post the picture while Rusty is distracted. Rusty checks phone after finishing with Camilla, Quinn tries to crack the safe. I’m now fairly sure this is what happened.
Another option I’ve talked myself out of The nerds. Possible they were hired by AAAs or Preps to prank the DIKs. this presumes the laptop is a red herring and it was done from outside the house.
I’ve now convinced myself the Riona/ Camilla/ Quinn theory is correct.