Finally we all know that Ali is actually alive! How long have you all been plotting to reveal that she is not actually dead?

Oliver Goldstick: For some time, actually. We basically had ideas last year about strong hints. And with our girls almost all of them have had delusional states and we always wanted to make it clear that these scenes with Ali (Sasha Pieterse) could be very real. Emily (Shay Mitchell) had that outside the barn with that asphyxiation. We had Spencer (Troian Bellisario) with the painkillers on her couch and Alison going through her bag. We had Aria (Lucy Hale) in her bedroom on cold medicine, and Hanna (Ashley Benson) in the hospital after being hit by a car.

All of them have had their encounters with Alison. We've been spreading this out, hinting to the audience and teasing was that a vision or did she really appear? What she's so good at though is knowing when they're so drugged up enough to make an appearance. [Laughs.]

Does anyone else, besides our liars, know that Alison is alive?

No. No, no no, by no means no. This is very privileged information and as we sort of hinted at last night, she isn't safe. The idea is she's sharing this with them but she's still on the run because there's still somebody after her.

Can we trust Ali?

That's a good question. Yes, because I think she has grown. You'll see in her appearances in 4B when she returns there's some remorse and some conscience that she didn't possess in the flashbacks that we've seen. There is some remorse about her behavior which led to the situation that she's in.