Pretty Little Liars follows four estranged best friends who are reunited a year after the leader of their clique goes missing, only to realize that they're all receiving anonymous messages from someone who knows all their secrets.

Episode Summary: Alison's brother returns to town and thwarts the girls' plans for her memorial service. Meanwhile, Det. Wilden reappears on the scene; and Hanna's home life threatens her social status at school.

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