With their freedom on the line, the Liars will come together to track down the villain who has been controlling their lives. However, on “Pretty Little Liars” Season 7, episode 19, the ladies’ investigation will also reveal the identity of a murderer.

“The Liars are convinced they know A.D.’s identity and gear up for a confrontation,” the synopsis for “Farewell, My Lovely” teases.

READ: New photos hint at A.D’s identity and Charlotte’s murderer on “Pretty Little Liars”

In the promo video for the Freeform series, Mona (Janel Parrish) can be seen looking agitated while telling someone who is sitting across from her that she always manages to have the game stolen from her.

Last week, photos of episode 19 were released showing the Liars in a room looking as if they are having an intense conversation with someone who looks like Mona. Could the Liars have finally found A.D.?

In the previous episode, Caleb (Tyler Blackburn) discovered that Mona stole Liar’s Lament out of Alison’s (Sasha Pieterse) house, and viewers were also given a look into Mona’s apartment where she had an entire room dedicated to the Liars. Is Mona part of the “A” team or has she been controlling things all along?

“Meanwhile, Spencer (Troian Bellisario), Hanna (Ashley Benson) and Caleb team up to investigate and discover new information about Charlotte’s (Vanessa Ray) death,” the synopsis for “Pretty Little Liars” Season 7, episode 19 says.

In the “Farewell, My Lovely” promo, Mona can be seen running out of a restaurant away from Spencer, Hanna and Caleb, but the group does not look as if they plan to chase after her. Spencer and Caleb can later be seen exploring a dark space together. Could they be closing in on Charlotte’s murderer?

In one of the photos that were released last week, Mona was seen holding purple roses. Later on in the promo for the Freeform series, a seemingly lifeless hand is seen laying on the grass, holding a rose.

Pretty Little Liars
On “Pretty Little Liars” Season 7, episode 19, Mona’s (Janel Parrish) secret will be exposed. Freeform

From there, the scene cuts to Charlotte in a casket where the Liars can be seen attending her funeral. Did Mona kill Charlotte or is she the person lying on the ground with the rose in her hand?

“Mary Drake (Andrea Parker) returns with a gift for Spencer and Alison,” the synopsis states. Although it is unclear what Mary could have for Spencer and Alison, in one of the photos for the upcoming episode, Spencer is seen speaking to Mary while holding a key.

READ: “PLL” showrunner teases Toby’s return to Rosewood

Earlier in the season, Mary revealed that she owned the Lost Woods Resort. Could she be leaving the establishment to Spencer and Alison to look after? Although the Hastings have been against Spencer making contact with her biological mother, she has been curious to learn more about the woman who gave her life. Will Spencer and Mary ever have a normal mother-daughter relationship, or is this gift Mary’s way of saying goodbye to her daughter and niece?

“Pretty Little Liars” Season 7, episode 19 airs Tuesday at 8 p.m. EDT on Freeform.

Pretty Little Liars
On “Pretty Little Liars” Season 7, episode 19, Spencer (Troian Bellisario) and Mary Drake (Andrea Parker) will come face to face once again. Freeform