List of Pretty Little Liars episodes

The series follows the lives of four high school girls, Aria Montgomery, Hanna Marin, Emily Fields, and Spencer Hastings, whose clique falls apart after the disappearance of their leader, Alison DiLaurentis.

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, including ones they thought only Alison knew.

[3] On January 11, 2011, ABC Family picked up Pretty Little Liars for a second season of 24 episodes.

[5] It was announced in June that a special Halloween-themed episode would air as part of ABC Family's 13 Nights of Halloween line-up.

On November 29, 2011, ABC Family renewed the series for a third season, consisting of 24 episodes.

[6] On October 4, 2012, ABC Family renewed the series for a fourth season, consisting of 24 episodes.