Al Baker starts to hang around Mac's office, and Peggy suspects he's homeless. Mac agrees to let Al sleep in his office. Peggy comes by with dinner, and finds the office filled with homeless people. Paige has nightmares, and Mac thinks it's odd that Paige left Peter several friendly messages when he knew she was mad at him. Olivia's scared to talk to Mac and Detective Garcia, and runs to Val's instead of meeting with them. Gary wants to get an attorney, but Abby says that will just make her look guilty. Detective finally questions Olivia, and takes out the locket. Olivia says she had given it back to Peter. Detective. Garcia pats her on the shoulder, but is really taking fibers from her school uniform. The fibers match fibers found on Peter's body, and police go back and accuse Olivia of the murder. Abby says she killed Peter.
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