The school's dance-a-thon gives the liars more than sore feet; Aria's old babysitter, Simone, comes to visit and sets her sights on Ezra.

Emily deals with a jealous teammate; Aria and Ezra their first public date; Spencer turns to Jason for information.

Emily and Paige are pitted against each other in the big race; Caleb calls in his favor with a guilty Hanna; Spencer takes on the task of tutoring a fellow student to get answers.

It's parent-teacher conferences and one little liar's father sits face to face with the love of her life. Better believe that "A" has something to say about it.

As tensions rise, the girls ponder the true nature of evil; Aria views the school play as an opportunity to get closer to Ezra, but will her plan backfire?

After a shocking revelation from the police, it looks like the liars could be crying wolf. With everything pointing to Ian, could the girls be wrong?

As the heat is turned up on suspicions surrounding Spencer, the liars must come to the harsh realization that they aren't the only ones hiding secrets in Rosewood.

Everyone has something to hide, but having to live with those secrets can become a big burden for the liars; Spencer and Toby aren't able to be seen together; Rosewood police officer Garrett keeps his promise to keep a close eye on the girls - much closer than they realize.

In the season one finale, the girls go to an unlikely source for help to put an end to "A" and the mystery surrounding their friend. Can they really stop "A" once and for all?

The liars face the fallout from what happened with Ian at the church, their parents have them talk with a therapist; Caleb returns to see Hanna; Spencer is told Toby is off-limits.