Spencer is visibly puzzled, and Alex startles her. She starts laughing gleefully as Mary walks up behind her and makes her way into Spencer's room, where she states they didn't think she'd wake up so early. Mary then injects Spencer with a sedative, causing her to fall asleep instantaneously. A few hours later, Spencer awakens once more, only this time attached to a holter monitor and with a foot chained to a bed. She comes face to face with Alex in tremendous stupefaction, who informs Spencer that their mother is preparing a special lunch for the three of them. Alex proceeds to share with Spencer details about the circumstances that lead to avenging their half-sister's memory before leaving for Aria and Ezra's wedding. A few hours later, Mary suddenly shows up to deliver Spencer's lunch and is met with accusations of having a helping hand in Alex's maneuvers. Mary reminds Spencer that she's a wanted convict for a murder she didn't commit. This causes Spencer to ask where they are but Mary is unaware of the location, however, Drake mentions that Alex promised to keep both of them secure. Spencer interrogates Mary on why she never told her about Alex's existence, to which Mary declares being unsure whether Alex was alive or not until she paid her a visit a few weeks earlier. According to Mary, the existence of a second twin was unbeknownst to the Hastings, since Alex was born minutes after Spencer had already been given to Peter and Veronica. Mary, desperate to escape Radley, allowed Doctor Cochran to arrange Alex's adoption in exchange for $500,000 and a resignation from the psychiatric hospital. Alex was later adopted by a wealthy British couple. However, she started to develop mental health problems at an early age, and the family that fostered her refused to tarnish their reputation. Alex was then stripped off her adoptive name and placed into an orphanage under her birth name. On her tenth birthday, Alex ran away from the Ambrose Home for Wayward Children, a year before Mary discovered she was there. Drake proceeds to unlock the code to Spencer's cell and the two share an emotional embrace. Spencer takes advantage of the momentum to steal one of Mary's hair pins and then uses it to pick the locks of her and Ezra's rooms. Later that day, Alex is then spotted angrily leaving a house with Mary in tow. Mary points out that Alex promised she wouldn't injure Spencer, and she angrily proclaims her need to dispose of "the proof" before grabbing an ax off the side of the building.