The Pretty Little Liars cast and crew has two more days of filming on the Season 4 summer finale, and director Norman Buckley is sharing clues about the climactic episode. What did he have to say about Season 4, Episode 12?

“Two more days of filming on #PLL summer finale.  Here's a clue: #LegerDeMain,” tweeted Norman earlier today.

For those who don’t know (we had to Google it, too), “legerdemain” is a French term used to describe a sleight of hand or an act of deception or trickery. The clue is especially intriguing considering PLL showrunner Marlene King tweeted a similar Season 4 clue last month: “Now you see me, now you don’t.” And she told fans “don’t blink” when watching the summer finale.

The clues seem to imply that some sort of magic trick or act of illusion will be central to the Season 4 plot. Is this a magic trick that has already occurred and will be explained in the summer finale? (Ali’s murder, for instance, or the “hallucinations” the Liars have been seeing of Ali.) Or could it be an act of illusion that will actually take place in the upcoming episode? Either way, the summer finale promises to be full of trickery.

What do you think Norman and Marlene’s clues mean? Share your theories in the comments below!

Catch the next episode of Pretty Little Liars on July 16, 2013 at 8 p.m. ET/PT on ABC Family.