A special episode encompassing the first three seasons of Pretty Little Liars.
In the season four premiere, the girls turn to Mona for answers.
The presence of Mrs. DiLaurentis in Rosewood continues to unnerve all those around her.
A clue in Ali's things leads the Liars to a creepy mask maker.
Toby finds a new source of information into his mother's death, but it only leads to more questions.
Spencer and Emily make plans to visit a nearby college, but they have very different agendas.
Toby and Spencer visit Ravenswood -- which is unlike any place they've ever seen.
Caleb and Toby team up to investigate "A" and what really happened the night of the lodge fire.
Aria relies on Jake to help her understand Mike's new attitude.
Paige throws Emily a surprise birthday party with even more surprising guests -- Jenna and Shana.
Ezra continues to reel from Maggie's big news when he's dealt an even more crushing blow regarding his son.
With "A" hiding out closer than realized, the Liars step up their investigation.
An intriguing riddle from "A" has the Liars hitting the road and heading to Ravenswood.
The Liars crash the Ravenswood Founders Day Celebration during the annual Halloween special.
Armed with the knowledge that Alison is alive, the Liars have more questions now than ever before.
The girls hope Ali's diary can shed light on their many questions.