S4, E3: Hanna worries that her mother is keeping a dangerous secret and is determined to protect her at all costs, which leads to an uncomfortable meeting with Detective Holbrook (recurring guest star SEAN FARIS – The Vampire Diaries, Reunion). A clue in Ali's things leads the Liars to a creepy mask maker, who takes a shine to Emily and may have ties to another Rosewood resident. Spencer and Toby (recurring guest star KEEGAN ALLEN) continue their search into a painful chapter of Toby's past and Melissa (recurring guest star TORREY DeVITTO) returns to Rosewood. Meanwhile, after "A" targets Emily's mom, Pam (recurring guest star NIA PEEPLES), Aria makes a desperate plea of her mom, Ella (recurring guest star HOLLY MARIE COMBS).