I'm getting weary of episodes that end with the detectives maneuvering the killer into confessing in order to prove his worth to the person who considers him incapable of it. Actually now that I type that out, I'm not sure it happens all that often, but it's so contrived that it doesn't take many uses to wear it out. Although I guess it's a little more credible that a teenager would be that foolish.
This episode was just too convoluted. Too many characters, too many agendas, too many twists. The actual killer kind of got lost in the shuffle and seemed to come out of nowhere.
Also, there were significant timing problems. In the teaser, it looked as though Ms. Nobile followed her daughter out of the classroom immediately after the posting of the video, searched for her, found the door ajar, went into the tunnels, and found Paul. But later we were told that he was found four hours after the video was posted, and that Nobile had learned the whole story from Tess in the interim. (Unless the detectives were talking about the beating video. Again, it was pretty confusing with all the different plot points and twists thrown in.)