Breaking the Code
Pretty Little Liars Season 2 Episode 21 (02/20/12)
After giving Jonah the $2,000 she borrowed from Jason, Spencer is disappointed to find out the information about A is only an old address. In addition, Caleb's work on the video reveals that her sister Melissa was in Alison's room the night she died. Although she tries to get some answers from Melissa, her sister ditches her to talk to Garrett. Melissa finally takes Spencer somewhere private where they can talk at the end of the episode.
Meanwhile, Hanna finds out that Mona is being blackmailed by A. Mona refuses to expose Hanna's shoplifting arrest at the expense of confessing to her own criminal activities; but it doesn't look like A is finished with Mona.
Also, Ezra is offered the job in Louisiana and considers ending things with Aria. Emily can't get a hold of Maya after their fight and is frightened when the police come to her house to ask about her girlfriend.