"MAGGIE Q and DYLAN McDERMOTT star as LAPD detectives for the Threat Assessment Unit who delve into the minds of stalkers to protect their targets from future incidents."
In the series premiere, Lt. Beth Davis and Det. Jack Larsen search for a stalker with an affinity for fire. Also, Beth meets an exasperated college student who claims his former roommate is aggressively harassing him.
Melissa (recurring guest star Torrey DeVitto) finally tells Spencer what she knows regarding the night Ali disappeared. But what is Spencer supposed to do with the knowledge? Knowing something is off about Alison's story, Emily is on the hunt for answers of her own. She enlists Ezra's help in finding out more about Cyrus and his past connection to Alison. Meanwhile, Hanna asks Spencer and Toby (recurring guest star Keegan Allen) for help with Caleb's drinking problem.
The CSIs investigate the cyber-related murder of a prominent casino owner's wife and receive help from the FBI's Cyber Crime Division. Patricia Arquette guest stars.
A new detective means new questions, and the Liars are asked some hard questions. Plus, Spencer lays a trap for Melissa (TORREY DeVITTO). ROMA MAFFIA (Nip/Tuck) guest stars.
Holbrook's (recurring guest star SEAN FARIS) partner, Lt. Tanner (recurring guest star ROMA MAFFIA – Nip/Tuck), comes to town, intensifying their investigation into the Liars and their possible connection to Wilden's death. Emily panics when her parents come under undue scrutiny due to the manipulations of "A." Hanna bristles when Caleb tries to help her through her this latest crisis, and tries to shift the focus of the police investigation. And Toby (recurring guest star KEEGAN ALLEN) finds a new source of information into his mother's death, but it only leads to more questions. Meanwhile, Aria has an uncomfortable encounter while out with Jake (recurring guest star RYAN GUZMAN), and Spencer lays a trap for Melissa (recurring guest star TORREY DeVITTO).
Hanna worries her mother is keeping a dangerous secret, which leads to an uncomfortable meeting with Detective Holbrook (SEAN FARIS). Melissa (TORREY DeVITTO) returns to Rosewood.
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).
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