ABC Family released a slew of new clips from tonight’s Pretty Little Liars summer finale, 3×12 “The Lady Killer.”

Watch the previews (beware of spoilers!) below and get ready for what looks like one of the show’s most intense episodes yet!

In the promo below, we see Mona looking in a mirror in a dank room, dressed in a black hoodie, of course. Someone calls her and she says, “I’m here… I understand,” before clicking off the phone.

Spencer and Paige face off by the lockers in the promo below — “If you don’t back down, you’re the one that’s going to get hurt, Spencer. I won’t let you come between us,” Paige snaps after Spencer confronts her. Spencer replies, “I know who you are,” before Paige slams her locker and walks away.

In this next teaser, titled “Tragedy in Rosewood,” ambulances fill the street and a body is carried out of one of the houses. “So the deceased was a friend of yours,” a police officer asks a stunned Emily as Spencer and Aria comfort a distraught, sobbing Hanna a few feet away.

The last clip shows Aria, Hanna and Spencer prepping to confront Emily. She thinks the three friends are inviting her over to apologize, but really they’re staging an “intervention” to convince her that Paige is “A.”

And finally, watch the full trailer for this week’s Pretty Little Liars summer finale, #TheBetrAyal, officially titled “The Lady Killer,” which airs tonight (Aug. 28) at 8 p.m. following an all-day PLL marathon.

Episode synopsis:

Garrett’s trial starts, which turns Rosewood into a media spectacle. Meanwhile, Emily is at odds with the other Liars and doesn’t know where to turn when the media attention becomes too much for her. Of course, “A” sees this as a perfect opportunity and sends Aria, Hanna, and Spencer on a path to a possible truce with Emily. But is A’s peace offering real or just a trap for a much darker ending? The Liars are also betrayed as someone very close to them is revealed as a part of The “A-Team”.

Will you be tuning in to the summer finale of Pretty Little Liars? Who do you think is in the body bag? Will the Liars finally discover another member of the “A” team? Share your theories below or head to our new Hypable forums to discuss the show with other fans!