Emily teams up with Mona; Ashley returns after learning frightening information; Spencer's family reels from A.D's latest taunt.

Cast: Troian Bellisario, Ashley Benson, Tyler Blackburn, Lucy Hale, Ian Harding, Shay Mitchell, Andrea Parker, Janel Parrish, Sasha Pieterse, Lesley Fera, Nicholas Gonzalez, Laura Leighton, Nolan North