Based on the Pretty Little Liars series of young adult novels by Sara Shepard, the series follows the lives of four girls — Spencer, Hanna, Aria, and Emily — whose clique falls apart after the disappearance of their queen bee, Alison. One year later, they begin receiving messages from someone using the name "A" who threatens to expose their secrets — including long-hidden ones they thought only Alison knew. The show stars Lucy Hale and Holly Marie Combs
Elenco: Troian Bellisario , Ashley Benson , Lucy Hale , Ian Harding , Laura Leighton , Shay Mitchell , Ian Harding , Ian Harding , Keegan Allen , Bianca Lawson , Brant Daugherty , Brendan Robinson , Chad Lowe , Claire Holt , Cody Christian , Eric Steinberg , Holly Marie Combs , Janel Parrish , Julian Morris , Laura Leighton , Lesley Fera , Lindsey Shaw , Nia Peeples , Nolan North , Roark Critchlow , Ryan Merriman , Sasha Pieterse , Tammin Sursok , Torrey DeVitto , Yani Gellman .