Credit: Video Still

The Pretty Little Liars Season 3 summer season ends on August 28 (sad!), and it looks like it's going to go out with a major bang.

In this preview of Season 3, Episode 12: “The Lady Killer,” Spencer (Troian Bellisario) confronts Paige (Lindsey Shaw), the voice over promises "the biggest betrayal of all," and the Liars "wait for 'A'."

Check it out below.

Credit: ABC Family © 2012 Disney ABC Television Group Photo: Pretty Little Liars Season Season 3 Summer Finale Preview: "We Wait for 'A'" (VIDEO)

Catch the PLL Season 3 summer finale on Tuesday, August 28 at 8 p.m. ET/PT on ABC Family.

Rebecca Martin is an editor at Wetpaint Entertainment. Follow her on Twitter @BeccaMartin47.

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