PLL, S3-E4: Birds of A Feather

Spencer decides to finally investigate her sister and brings the girls to snoop around Melissa's apartment while she keeps her busy. Although they don't find any medical records, they do find a costume bag with a feather that matches the one from the mysterious black swan. When Spencer confronts Melissa, she confesses to losing the baby shortly after Ian died and that she was blackmailed into wearing the costume. Meanwhile, Emily meets Maya's cousin Nate who moved to Rosewood for school. And Hanna decides to be more honest with Caleb...until A threatens Caleb's Montecito family. Caleb becomes frustrated with Hanna's silence and breaks up with her. Also, Jason returns to offer a $50,000 reward for information about his sister remains, and he may have found a credible witness.

Source: TV Fanatic