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, … Lucy Hale, Troian Bellisario, Ashley Benson, Shay Mitchell, Sasha Pieterse, Ian Harding, Laura Leighton Added on Amazon Prime 2023-03-16.