The girls may have found “A.” After an explosive reveal during last week’s installment of “Pretty Little Liars,” the ABC Family series is ready to continue its “summer of answers” in episode 6.

Episode 6, titled “No Stone Unturned,” will find the Liars “on a mission to get concrete proof” about Lesli (Elizabeth McLaughlin). Viewers will remember that Lesli, an old friend of Mona’s (Janel Parrish), was first introduced in Season 5 after Mona was “murdered.” It was thanks to Lesli’s testimony that the Liars ended up in jail as an accomplice to Alison (Sasha Pieterse). The girls and Alison were ultimately cleared for Mona’s murder after she turned up in “A’s” Dollhouse … but now the cops suspect that Lesli teamed up with Mona to fake her murder.

Lesli reappeared in episode 5 to confront Mona about causing problems in her life, and promised she’d get revenge. But that wasn’t the big shocker of the evening. Hanna (Ashley Benson) and Spencer (Troian Bellisario) discovered that Mona was trying to steal Lesli’s file out of Radley!

That’s right; Lesli was also a Radley patient. Turns out that the teen was staying at the sanitarium at the same time as Mona, Bethany Young AND Charles DiLaurentis. In fact, Lesli was roommates with Bethany Young, the girl whose body was mistaken for Alison’s. Could it be a crazy coincidence? The Liars don’t think so.

The episode 6 synopsis continues that “all signs” point to Lesli as the “tormentor in the hoodie.” Spencer, Hanna, Aria (Lucy Hale) and Emily (Shay Mitchell) want as much poof as they can get to bring to the police … but “A” is onto them. The deeper their investigation into Lesli gets, the more that the threats from “A” “escalate.”

“Pretty Little Liars” is taking a week off. Episode 6 will air on ABC Family on Tuesday, July 14 at 8 p.m. EDT.