Credit: Eric McCandless/ ABC Family Photo: Pretty Little Liars Season 3, Episode 17: Byron

Byron Montgomery may be the “coolest” dad in Rosewood, but even actor Chad Lowe will admit, he’s also the sketchiest.

When it comes to Pretty Little Liars, even the adults in Rosewood have been doing some lying. Could Byron’s confrontation with Ali land him in hot water with Aria (Lucy Hale)? Or even worse, was Byron responsible for Ali’s murder?

Wetpaint Entertainment spoke with Lowe at the 2013 TCA Winter Press Tour, and he dished a few dirty details on Byron’s secret and how it will affect his fragile father-daughter relationship with Aria.

Wetpaint Entertainment: Byron is kind of at the forefront with the new revelation that him and Ali had some sort of confrontation. What's going on?

Chad Lowe: Well, the term I got a lot of on my Twitter was sketchy.... We certainly learn more about the nature of his relationship with Alison, and we also see the toll that it takes on Aria, which I think is the focal point of seeing how they were just starting to build a trust with one another, and then this bombshell dropped on her. Let's say it stresses the relationship a little bit.

Is the focus now more on that than their personal relationship and his girlfriend and ex‑wife? Does it shift to the murder mystery?

I think it all gets thrown into the pot. It becomes this bubbling cauldron of mystery and intrigue. How's that for a quote?

You direct some of the episodes. Do you get more from Marlene than the others as far as bigger arcs?

Well, I get a lot of tone notes and some sense of where certain stories are going because oftentimes where they know they're going, they need a certain tone in a scene. So I'm kind of the guardian of a tone, and I can also help the actors too because they all have questions about, “Well, I'm saying this, but what do I really mean? Where am I going with this?” And a lot of times, I can say, “I can't tell you, but you're in the right ballpark.” When you're a guest director, you try to give the producers options. So I'll always try to give different performances. One version of a line reading that's read a certain way, and I'll say, “Hey, you know what? Let's try it a different way completely,” and then they always have that in the editing room because they're also molding the performances and the story in the edit. So I try to give them as many options as I can.

It's funny because I've been talking to Keegan quite a bit, and he didn't know he was on the “A” Team, but everything he's done so far feeds into it. I was wondering, maybe they tell you.

What’s interesting is – as I’m sure Keegan would tell you – even he has no idea where it’s all going, and I think the actors have embraced that. I think part of the fun of the show is not knowing where the writers are going to take us. I know for me, that’s a lot of the fun is seeing where each character’s evolving to. I know they’ve got an endgame in mind, but I even saw on Twitter today, Marlene said she knows where it’s all going, but they like to have a little latitude so that they can take the characters in different directions.

Can you tease the finale in broad strokes?

Unexpected, shocking – all that! These guys know when it’s a tent pole episode like the season finale, the Halloween episode, they make sure to load those up. So there’s not a dull moment.

Catch the next episode of Pretty Little Liars on Tuesday, January 15, 2013 at 8 p.m. ET/PT on ABC Family.