To put the past behind is not an option at this point for the girls in "Pretty Little Liars" Season 6 Episode 6, entitled "No Stone Unreturned."

They may have been home following a very distressing experience at the doll house, but things aren't exactly going back to normal (things hadn't been since "A" came into the picture, right?).

In season 6 episode 6 of "Pretty Little Liars," the ladies are reportedly suspecting someone of being the new "A," and all the signs are pointing towards Lesli Stone. To support this theory in front of the authorities, the Liars need to find concrete evidence.

Spencer (Troian Bellisario) and Hanna (Ashley Benson) found out that Mona (Janel Parrish) and Lesli (Elizabeth McLaughlin) met in Radley, where they were admitted together with Charles DiLaurentis and Bethany Young.

A couple of sneak peeks at "Pretty Little Liars" Season 6 have been revealed online. One of the clips shows Kenneth DiLaurentis finding a birthday card on the windshield of his car. What did the card say and who is it from?

It wasn't revealed. The official teaser clip can be watched below.

In another clip, Sara (Dre Davis), who's working closely with Caleb (Tyler Blackburn), tells the latter a very disturbing statement.

"When you're forced to answer to someone else's name and wear their clothes you become curious about her," she says in the clip.

See below to watch the sneak peek.

Another teaser shows an encounter between Sara and Emily (Shay Mitchell) about her [Sara] new job. Fans know Emily's character too well, and with some hinted spark during the conversation as per Yibada, can it be assumed that she will become the swimmer's new girl?

See the video below.

So Hanna's been giving Caleb a cold shoulder huh? In the sneak peak below, he appears unexpectedly at the Marin residence.

Hanna refuses to have breakfast with her mom and Caleb, citing that meeting up with Spencer is the reason. He offers her a ride only to be declined, telling him she will just call later instead.

Could this get even more complicated? More details for "No Stone Unreturned" the 6^th episode for "Pretty Little Liars" Season 6 will be unveiled on ABC Family at 8 p.m., on Tuesday.