Pretty Little Liars did not exactly deliver the fascinating good last night airing one of its slowest season two episodes.

But might "Let the Water Hold Me Down" simply have served as the calm before the crazy, revealing storm?

Yes, according to the following ABC Family promo, which teases next Monday's "Blond Leading the Blind" as an episode that will unveil the "biggest secret" yet. What might it be? And how might Toby pay the price for the gals' discovery? Watch now to get an idea of what's ahead on both PLL and The Lying Game...

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.