The Pretty Little Liars need a friend, but they'll have to settle for a dubious former foe instead.

Rosewood is rife with hidden truths, but it's no secret that the Liars have made plenty of decidedly questionable decisions over the last six seasons. "The Talented Mr. Rollins" will see the women cross the line in epic fashion, however, and, whether they like it or not, Mona (Janel Parrish) will soon be in on their cover up.

"Hit and Run Run Run" will see the episode 3 fallout unspool, to the detriment of all involved.

"The PLLs desperately attempt to cover up their secret, and in turn, end up straining their relationships with their respective bed buddies by keeping them in the dark," Freeform teased. "While the aftermath of Haleb's kiss weighs on Spaleb's relationship, Spencer copes in ways she might later regret. Mona intervenes with the cover-up plan, for better or worse."

Is Mona on their side? The original 'A' is a virtual doyenne in the world of subtle subterfuge, which is a talent our sleuths could certainly use. Mona, however, is also a manipulative little menace with has a long history of screwing people over. Will she extend a helping hand, or will she drop the Liars off the edge of a cliff, Lion King style?

Emily (Shay Mitchell), Hanna (Ashley Benson), Spencer (Troian Bellisario), and Aria (Lucy Hale) could use all the help they can get, especially after 'Uber A' gets wind of their dirty little secret.

"The PLL's will make their biggest mistake of their lives, and Uber A is going to use it to fuel A's final game," King told Hollywood Life.

Sounds like the Liars will be forced onto their back foot once more...

Dive into the deadly world of Rosewood when Pretty Little Liars airs Tuesdays at 8 p.m. ET on Freeform. Check out a preview for the series' next episode, "The Talented Mr. Rollins":