This is the picture that might prove that the liars are there for Mona, rather than Lesli. She knows something and based on her acting normal, this could be her new lair and it would be a perfect cover up.
Mike takes a break from Beacon Hills in order to stir up some drama for some old friends. We have yet to witness any scenes with him and Mona since she like returned from the dead, so this should be super interesting.
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.