Given that the official episode description says that Kenneth Dilaurentis gives the liars clues they need in order to find out the truth once and for all,it only seems natural that the liars would be a little under pressure to get to the Radley documents before they are destroyed.
Considering the WTF look that Emily and Spencer are giving Aria, we think it's fair to say that they have some beef with her, but why? They can't rip these friends apart AGAIN. I guess we'll have to tune in and see what's going on.
You think the truth is this big shiny disco ball of purity then go ahead and try it. See what it gets you. Telling the truth to the wrong person at the wrong time is how I ended up where I did. Take it from me you're always better off with a really good lie.