"Pretty Little Liars" fans are in for a big surprise during Tuesday night's summer finale, and showrunner Marlene King has promised a twist so unexpected that viewers will be "left speechless."

In a revealing interview with The Hollywood Reporter, King teased several juicy plot points that the series plans to explore throughout the second half of the season -- as well as the huge shocker in store for the cliffhanger summer episode.

"Maybe more than any other [finale], this one takes the show in a very unexpected direction. There is a dark turn and it's a surprising turn," King told THR. "I have goosebumps even telling you this - fans are going to be left speechless. I think it's one of those where, even people here who have seen the episode who work on the show, their jaws hit the floor. Tissue boxes were out; people were crying."

King went on to explain that the episode will indeed pay off on the promise to kill a major character. Writes THR:

The episode - described by King as "thrilling, sad and shocking" - starts off on Thanksgiving Day, before flashing back 36 hours earlier. With "a hint of the holidays coming up," King says the summer finale, titled "Taking This One To the Grave," layers in big clues for the Christmas episode airing later this year.

For more hints from King about what to expect tonight and later this season, check out the full interview. "Pretty Little Liars" airs its summer finale at 8 p.m. tonight on ABC Family.

via: The Hollywood Reporter

Photo credit: Getty Images

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