[1] The first television series also entitled Pretty Little Liars began airing on ABC Family in June 2010; meanwhile, additional books continued to be published.

[6] Set in the fictional Rosewood, Pennsylvania, a wealthy suburb of Philadelphia, the book series follows the lives of four teenage girls whose clique falls apart after the disappearance of their queen bee leader, Alison DiLaurentis.

Three years after her mysterious disappearance, the girls begin receiving intimidating messages from an anonymous character named "A", who threatens to expose their secrets, including long-forgotten ones they thought only Alison knew.

When the boy is found dead in the exact way they thought, the girls become prime suspects and start a quest to find the real murderer.

One year later, the estranged friends are reunited as they begin receiving messages from a mysterious figure named "A" who threatens to expose their deepest secrets.

The series features an ensemble cast, headed by Troian Bellisario as Spencer Hastings, Lucy Hale as Aria Montgomery, Ashley Benson as Hanna Marin, Shay Mitchell as Emily Fields, Sasha Pieterse as Alison DiLaurentis and Janel Parrish as Mona Vanderwaal.

[31] Ravenswood is an American supernatural teen drama, mystery-thriller television series created by I. Marlene King, Oliver Goldstick and Joseph Dougherty.

Starring Nicole Gale Anderson, Tyler Blackburn, Steven Cabral, Brett Dier, Britne Oldford and Merritt Patterson.

The series is a stand-alone sequel to Pretty Little Liars and was loosely based on the novel The Perfectionists by Sara Shepard.

It is the second spin-off series of Pretty Little Liars, which included Sasha Pieterse and Janel Parrish reprising their roles as Alison DiLaurentis and Mona Vanderwaal, respectively.

It stars Sofia Carson, Sydney Park, Eli Brown, Hayley Erin, Graeme Thomas King and Kelly Rutherford.

[39][40] The first season, titled Original Sin, consists of 10 episodes and stars Bailee Madison, Chandler Kinney, Zaria, Malia Pyles, and Maia Reficco.