Pretty Little Liars is full of twists, turns, and so many mysteries it's hard to keep count, and very few people know the truth behind the secrets. One of those people is Executive Producer Oliver Goldstick, who recently dished some juicy spoilers about Season 3B to the Huffington Post.

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On Byron and Meredith: Not only is Byron Montgomery (Chad Lowe) now a major suspect in Alison's (Sasha Pieterse) death, but apparently Byron and Meredith being back together "is going to raise some really scary questions and Meredith's role possibly in Alison's demise [will] also be explored." We can also expect to learn more about Meredith's motivations.

On Dr. Sullivan. Dr. Sullivan is also back, and Oliver hints that "she may be helpful ... in unlocking the mysteries of the summer Ali died." Maybe by pointing the girls to a certain diner?

On Melissa: Melissa Hastings (Torrey DeVitto) is also back, and Oliver teases that this season will explore "all things Alison and that summer," and notes "Melissa's ties really involve her relationship with Alison, as toxic as that was and is."

For much more from Oliver, check out the whole interview here.

Find more Pretty Little Liars spoilers here.

Source: Huffington Post

Catch the return of PLL Season 3 on Tuesday, January 8, 2013 at 8 p.m. ET/PT on ABC Family.