The series involves a group of 5 teenage girls; Spencer (Troian Bellisario), Aria (Lucy Hale), Emily (Shay Mitchell), Hanna (Ashley Benson) and their disappeared friend Alison (Sasha Pieterse). Also, their love intrests; Ezra (Ian Harding), Caleb (Tyler Blackburn), Toby (Keegan Allen) and Paige (Lindsey Shaw).