Pretty Little Liars is a twisty TV mystery, and in the grand tradition of such shows, it sometimes feels like the writers are making things up as they go along.
We don't mean that as an insult. Writerly improvisation is part of the TV process, and half the fun of following a show is watching the writers adapt as they learn what does and doesn't work. However, in a story as complicated as PLL, it's nice to know that they have some things established ahead of time.

So, has showrunner Marlene King decided who the head of the "A" team — often referred to as the Big "A" by fans — is?

She has, indeed! When a fan asked Marlene if she knows who Big "A" is, she confirmed that she does know. Though whether or not she's shared that info with the other writers is still unknown.

The writers do know who a third member of the "A" team is, and it's someone the viewers already know. Is he/she the Big "A", or yet another part of the team?

We can't wait to find out ... one day.

Find more Pretty Little Liars spoilers here.

Catch the next episode of Pretty Little Liars on Tuesday, February 12, 2013 at 8 p.m. ET/PT on ABC Family.

Source: @imarleneking