Four estranged friends are brought back together after each begins to receive frightening letters.
Jenna Cavanaugh returns to Rosewood; questions arise surrounding Ali's death.
Relationships are explored among the girls as they pay tribute to Alison's memory.
The girls try to put a stop to "A."
The girls pay the price for trying to ignore "A" a new male arrival changes the status quo.
Disturbing secrets threaten to ruin the girls' homecoming dance; an odd date choice leads to a sticky situation.
The girls deal with the aftermath of the homecoming dance.
Alison's brother Jason arrives in Rosewood as last-minute preparations are made for her memorial.
The girls are trapped in the school during a bad storm.
The girls go glamping -- and Hanna makes a dangerous discovery.
Everyone must deal with the aftermath of what happened at Camp Mona.
Surprises haunt the Liars as "A" continues the game.
Toby faces some struggles. And the Liars get a little help from an unexpected source.
A Liar doesn't always get what she wants...
The guilt that comes with secrets can sometimes overwhelm a pretty Liar.
Hanna discovers something shocking about Caleb.