Maybe page 5 mentioned sth about Ali being pregnant and Wilden was covering that up as the girls originally guessed. Remember how freaked out she was? This would be consistent with why Wilden wanted to "shut Hannah up" when Hannah confronted him about the pregnancy issue. Maybe that's the truth Ali told Melissa the night she disappeared (quote Ali to Hanna at the hospital: telling the truth to the wrong person at the wrong time made me end up where I am now). So maybe Jason saw Ali and Melissa talk that night not Cece and her. Or maybe Cece is the one that told Melissa and hence Ali referring to the fact that she shouldn't have told Cece in the first place. This may also be the reason those videos were really important to Melissa more than anyone else and why she hated Ali so much. It's also consistent with why Melissa would call Wilden in Byron's flashback of the night Ali went missing (Melissa on the phone: do I have to call 911 to get your attention? Garrett wasn't in the police force then) Wilden and Melissa had partied in Cape may together and Melissa at the time trusted him with the whole killin and/or burying Ali/Bethany situation. it'd make sense for her to call her bestie in the police force to figure out what to do and how to keep her family safe. But she may have found later through Garrett who was "the only one that was honest" with her, about the pregnancy thing. Melissa told spencer all she'd done was to protect her and that she, like everyone else was scared of Wilden. So Wilden may have blackmailed her to help him kill Garrett to keep HER family safe. If she was indeed the other queen of heart on the train, it'd make sense for Wilden to say "leave her (Aria?), Garrett is going to tell them everything" and for him to kill Garrett. He also thought Garrett may have told spencer about it so he may be the one that tried to kill spencer. Melissa also ditched spencer once at the bar to meet up with Garrett, later she told spencer that she ended up sharing A LOT that night. Is that potentially another reason that Garrett ended up dead?