Monsters in the End

Monsters in the End is the 21st episode in the series. This episode will be aired on March 14th 2011.

Summary
Everyone has something to hide – whether it be a secret romance, who they really are and what their true intentions are. For Aria, Emily, Hanna and Spencer, keeping things hidden is second nature, but having to live with those secrets can become a big burden. How long can Aria be with someone when they can’t go out in public? Is it an true friendship when Spencer and Toby aren’t able to be seen together? How truthful can Emily be when she can’t be honest about whom she wants to be with? And how can Hanna move on when she secretly still wants to be with the one who broke her heart? With someone like "A" out there to watch their every move, four Liars may not have to worry about keeping things hidden for too much longer. Meanwhile, Rosewood police officer Garrett Reynolds is keeping his promise to keep an close eye on the girls – much closer than they realize.

Main Cast
Lucy Hale as Aria Montgomery

Ashley Benson as Hanna Marin

Shay Mitchell as Emily Fields

Troian Bellisario as Spencer Hastings

Sasha Pieterse as Alison DiLaurentis