For those who have forgotten, in Season 2 Jason came back to town and bought the DiLaurentis house. At the time he was acting super sketchy, so when Spencer (Troian Bellisario) spotted a figure moving in the house and Jason denied there was anyone else there, we were suspicious. When he immediately started papering up the windows, we got really suspicious.
While we trust Jason more these days, we still wonder who was in the house, and it sounds like this mystery is going to be addressed in Season 3. You know what that means: Speculation time!
Here are some of our theories about who may have been in the house.
Ali or her twin: Yep, it's our favorite theory again. If Alison (Sasha Pieterse) or her theoretical twin is alive, it's quite possible that she turned to her older bro for help hiding. This might explain why Jason was so obsessed with getting her body back this season, too: If the body somehow gives away that Ali is really alive and he's trying to hide her, he wouldn't want that evidence out there.
Someone from the "A" team: As we said above, we've come to trust Jason somewhat, but you never know who could be part of the "A" team on this show. If Jason is involved with the team, maybe they were using his house as a home base from which to carry out some of their evil plots.
Someone from the NAT club: While Jason doesn't seem buddy-buddy with his old NAT club friends, it's possible their bonds run deep enough that he's willing to help them (or perhaps they are even able to blackmail him). If the club is up to something again, perhaps they used his house as a meeting place.
What do you think? Let us know in the comments below!