Hush, Hush, Sweet Liars

Hush, Hush, Sweet Liars is the twentieth episode of Season 6 of Pretty Little Liars and the 140th episode of the show overall. The episode marks the sixth season finale and it aired on March 15th, 2016.

Synopsis
With the stalker threatening to kill all of them if they don’t divulge Charlotte’s killer by the election, the PLLs and company, at wit’s end, must boldly fight back. As Spencer and Toby work together to catch Sara Harvey, Yvonne wonders where Toby’s true affections lie. Ezra finishes the last chapter of his book, finally ready to say goodbye to Nicole; Aria comforts him during this emotional time and old feelings bubble to the surface. While Caleb works intently on his plan to protect Hanna, they reflect on what could have been.

Meanwhile, Alison experiences strange visions and starts to question her sanity; Emily keeps tabs on her to make sure she’s okay.

Spoilers

 * Mary Drake was revealed as Jessica DiLaurentis' twin sister and the mother of Charles Drake (also known as Charles DiLaurentis).
 * Mary Drake is working along with Elliot Rollins to obtain the Carissimi Group's money and to avenge Charlotte DiLaurentis.
 * Ezra Fitz and Aria Montgomery started an affair.
 * Hanna Marin and Caleb Rivers kissed.
 * Veronica Hastings won the election.
 * Alison Rollins admitted herself to Welby State Psychiatric Hospital.
 * At the end, Hanna Marin's unconscious body is dragged by Uber A in The Church.

Title and Background

 * The name of the title is a reference to the 1964 psychological thriller film Hush…Hush, Sweet Charlotte.
 * The title was first revealed by I. Marlene King through her Twitter account. (Source)

Main Cast

 * Troian Bellisario as Spencer Hastings
 * Ashley Benson as Hanna Marin
 * Lucy Hale as Aria Montgomery
 * Shay Mitchell as Emily Fields
 * Janel Parrish as Mona Vanderwaal
 * Sasha Pieterse as Alison DiLaurentis

Supporting Cast

 * Ian Harding as Ezra Fitz
 * Keegan Allen as Toby Cavanaugh
 * Tyler Blackburn as Caleb Rivers
 * Andrea Parker as Jessica DiLaurentis & Mary Drake
 * Nolan North as Peter Hastings
 * Lesley Fera as Veronica Hastings
 * Kara Royster as Yvonne Phillips
 * Huw Collins as Elliot Rollins
 * Bryce Johnson as Darren Wilden

Trivia

 * The table read and shooting for the episode happened before "Burn This" and "Did You Miss Me?" for unknown production reasons.