Credit: ABC Family

Spencer (Troian Bellisario) is always one of the most interesting Little Liars, and it sounds like her story is only going to get more complex in the second half of Pretty Little Liars Season 4. Now that Ali is back and secrets are coming out, we might learn that this enigmatic high schooler has even more hiccups in her past than we know.

So, what can we expect from Spencer when the show returns January 7, 2013? We've gathered all of the biggest spoilers about Spence right here for your reading pleasure.

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Spencer's secret. Troian Bellisario has dished that we're going to "learn the most fun secret about Spencer," and it has something to do with the night Ali disappeared. Remember how Spencer was awake before all of the other girls that day? Yeah, that will finally gets cleared up. "As we’re going through the season you’re hearing a lot more and understanding more about the night and Spencer’s state and why she had the fight with Alison." Is this secret why she might be headed towards another breakdown of some sort?

A "Patrick Bateman moment." Troian also teases a "Patrick Bateman" moment for Spence. For those not in the know, Patrick Bateman is the murderous protagonist of American Psycho. Does this mean Spence is gonna snap? Could she actually kill someone? Does she just really need to return some videotapes? We can't wait to find out!

Investigator Spencer is back! According to Sasha Pieterse, Spencer is "hot on Ezra's trail" this season. Does that mean she'll be the first one to find out the truth about this hot teach?

How will Spoby fare? Spencer and Toby's relationship has survived many a rough patch, so will it finally be smooth sailing for them in Season 4B? Honestly, it sounds like the answer is a definite no — but then, when does any couple have smooth sailing on this show? We know Keegan Allen took some time off to make his Off Broadway debut, and the couple will really have to tangle with trust issues, but we have faith things will work out in the end (even with the return of Andrew). For more Spoby details, check up our full roundup here.

What do you think Spencer's secret is? Sound off in the comments below!

Catch the Pretty Little Liars Season 4 winter premiere on Tuesday, January 7, 2013 at 8 p.m. ET/PT on ABC Family.

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google+!