An old enemy will continue to torment the Liars when "Pretty Little Liars" returns for season 7.

Based on the Twitter post of writer Bryan Holdman, Jenna (Tammin Sursok) is back in Rosewood. Incidentally, her first stop will be at The Radley, where she will meet some of the town's interesting people as she drops by for a drink.

Fans of the show are wondering what Jenna is up to as she returns during a chaotic time for the Liars. Hanna (Ashley Benson) is still missing, while Alison (Sasha Pieterse) is spending time at a mental institution for mistakenly believing that she is seeing dead people. Will this mean that the Liars are in for more trouble now that Jenna is back in town?

Meanwhile, the premiere episode for "Pretty Little Liars" season 7 will center on the Liars' race against time as Spencer (Troian Bellisario), Aria (Lucy Hale), and Emily (Shay Mitchell) do everything to save Hanna.

The official synopsis for the premiere episode, titled "Tick Tock Bitches," reads:

"The PLLs are racing against the clock to save one of their own. The only way to do this is by handing over evidence of Charlotte s murderer to Uber A."

But the Liars' job of taking care of their friends will not be over in the premiere episode, as they shift their focus on Ali in episode 2 called "Bedlam."

According to the synopsis for the episode, "The PLLs worry Ali is being tortured by Uber A, but aren t allowed to visit her in the mental institution where she s being held. In desperation, they turn to a potential enemy for help."

Does it mean that the Liars will seek the help of Ali's husband, Dr. Rollins (Huw Collins), who actually turns out to be working for her unknown aunt Mary Drake (Andrea Parker)?

The premiere episode of "Pretty Little Liars" season 7 airs on Tuesday, June 21, on Freeform.