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OTRC: 'Pretty Little Liars' renewed for a fourth season

The cast of 'Pretty Little Liars' appears in a promotional photo for season 3 in 2012. (ABC Family)

Looks like ABC Family viewers will get a lot more secrets and mystery from "Pretty Little Liars."

The cable network announced on Thursday, October 4, that the teen soap drama has been renewed for a fourth season. The new season will consist of 24 one-hour episodes that will begin to air in 2013.

"Pretty Little Liars," which aired its shocking mid-season finale in August, is set to return for a Halloween-themed special episode on Tuesday, October 23, at 8 p.m. ET/PT. The second half of season 3 will kick off in January.

The show is billed as ABC Family's No. 1 series of all time, according to a statement from the network, and the No. 1 cable series of the summer of 2012 in key demographics like viewers 12-34 and females 12-34. It was also the No. 1 scripted cable series in women 18-34.

The show also thrives in social media platforms like Twitter and Facebook. The mid-season finale of "Pretty Little Liars" on August 28 generated more than 709,000 Tweets, which peaked at 36,000 Tweets per minute.

The series tells the story of four girls, Hanna (Ashley Benson), Aria (Lucy Hale), Emily (Shay Mitchell) and Spencer (Troian Bellisario), whose lives fall apart after the disappearance of their clique leader Alison. A year after Alison's death, the girls are tormented by a mysterious character named "A" who threatens to expose their secrets as well as their lives.

When viewers last saw the girls of the fictional town of Rosewood, Pennsylvania, they discovered who killed Emily's girlfriend Maya, Hanna's boyfriend Caleb was shot in the abdomen while protecting Emily from the killer and the audience learned that Spencer's boyfriend Toby was part of A's team.

The Halloween-themed episode, titled "This is a Dark Ride," features the girls going to a Halloween party on the Rosewood Ghost Train.

According to the episode synopsis, "The girls are in for much more than just some childish trick or treats. With 'A' running amuck and unexpected party-goers popping up at every turn, this Halloween event becomes one killer party."

Adam Lambert is set to make a guest appearance on the episode, performing his songs "Trespassing" and "Cuckoo."

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