Bite Your Tongue

Bite Your Tongue is the seventeenth episode of Season 4 of Pretty Little Liars. It aired on January 28, 2014.

Synopsis
Hanna's new interest in crime novels helps her to come up with a plan to try and figure out whose body is in Ali's grave. While Hanna is on her hunt, Spencer is working overtime to decipher the stories in Ali's diary which she hopes will reveal the identity of Ali's mystery man. But with both girls hot on the trail, will their work lead them straight into "A's" path?

Meanwhile, Aria is upset with the new friend Mike has made and Emily's dad is concerned about her behavior.

Title and Background.

 * This phrase is about keeping quiet, especially when the truth could be hurtful, or if the speaker had an urge to reveal it.

Main Cast

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

Guest Cast

 * Ian Harding as Ezra Fitz
 * Brandon W. Jones as Andrew Campbell
 * Cody Allen Christian as Mike Montgomery
 * Larisa Oleynik as Maggie Cutler
 * Eric Steinberg as Wayne Fields
 * Sean Faris as Gabriel Holbrook
 * Wes Ramsey as Jesse
 * Rose Abdoo as Dr. Sandy

Trivia

 * The episode was co-written by Maya Goldsmith.
 * The table read was on August 13, 2013.
 * Filming began on August 14, 2013 and ended on August 22, 2013.