Only a few episodes remain in the summer season of “Pretty Little Liars” -- and the part A finale of season four promises to “unleash its most shocking moment yet.”

“Get ready for World War A,” teases an ABC Family synopsis of the summer finale at SpoilerTV. So, what kind of drama can fans expect to see in episode 12, “Now You See Me, Now You Don’t”?

“A” will have Aria, Spencer, Emily and Hanna on “a quest” that will lead them straight to their creepy neighboring town, Ravenswood. Familiar faces will surround the girls, but will the trip to Ravenswood prove to be more useful than Spencer’s and Toby’s visit in episode six?

While in town, the Liars will be attending a “very special magic show,” so magical that one of the ladies actually disappears. According to the summer-finale synopsis, the disappearing act will leave “the other three scrambling to make sure she hasn’t succumbed to ‘A’s’ tricks.”

Fortunately, it appears the missing Liar will be found, and the unlucky foursome will try to skedaddle out of Ravenswood before more trouble arises. However, a “shocking discovery” will stall their escape. The synopsis reveals that the mysterious “shocking discovery proves that everything they thought they knew about ‘A’ and the ‘A’ team might be wrong.” The new information “may just have started ‘World War A,’” the episode 12 description teases.

But that’s not all “Pretty Little Liars” viewers will be sinking their teeth into. Hanna and her mom will have (another) joyous reunion -- that will be cut short when “A’s” sights are set on a new target.” Could “A’s” new target possibly be Caleb?

Toby will also continue to unveil some “surprising information” -- this time about Wren. Could the new scoop have something to do with the death of Toby’s mother? Or is Wren one of the “A” team members?

The summer finale of “Pretty Little Liars” will be shown on ABC Family Aug. 27 at 8 p.m. EDT. What do you think will happen in episode 12, “Now You See Me, Now You Don’t”? Let us know in the comments section.