Plot summary
The liars are on the hunt for answers of what Alison knew before she died. The girls meet a boy named Duncan from Alison's past, he explains how he and Ali were good friends during the summer before she returned to Rosewood and went missing. He reveals he was with Ali the day she was murdered and Ali had returned home earlier than she led the girls to believe. Toby returns to Rosewood still angry at Spencer and helping Jenna again although he suffered from her in the past. After a confrontation with Hanna, he assures her he knows what he's doing.
Jenna undergoes her eye surgery but the effectiveness of the surgery is still unknown for the time being. Jason gives the girls a bag of Ali's personal items which the girls don't seem to understand until Spencer notices the box was covered with highlighted newspapers from the summer Ali died and realizes there is some pattern to it all. Jenna is injured in a fire at Jason's house but is saved by Hanna. ' A' ending: 'A' places a police badge at Jason's house.
Credits
Adapted from Wikipedia contributors, Pretty Little Liars season 2. HTML formatting and reference markers removed.