*Review contains spoilers, so read at your own risk!*
Finally, they come to the conclusion that I've been thinking ever since this whole thing with Baitfish, i.e. Paul. That the sister is in on it! I thought that from the very beginning. Glad to know that I was right and that they finally know it, too.
Though I do feel bad for Pride. Here was this sister, Sasha, who Pride actually started to like and thought was helping the case, but then it turns out that she's been helping Paul the whole time. He had the bad guy right in front of him and he didn't even know it. He's like Gibbs, though, when he gets mad. Especially when someone hurts his family. And this family has literally hurt Pride's family. Almost killed Laurel and not to mention her boyfriend got seriously hurt (though it sounds like he's doing fine).
However, with him being like Gibbs in this way and getting so obsessed with the case until the jerk is caught, isn't a good thing. The team starts to worry more and more about their boss. Especially when they find a whole obsession wall in his room when they don't even know where Pride went to.
Here comes the kicker, Paul and Sasha are a thing! At least, that's what I gathered from the scene at the end. Now it all makes sense. Why she'd be protecting him and trying to make it come off her being the innocent person who the bad guys are after. But I for sure, would not want to be the bad guy that Pride is going to direct all his anger towards. If he really is anything like Gibbs, the bad guy probably won't stay alive for long.