Recently uncovered pages from John Hinckley Jr.'s diary, which he began writing after he was arrested for trying to assassinate President Ronald Reagan; an interview with the officer who questioned Hinckley after the attempted assassination.
After surviving a hit against him, Voight is convinced the culprit is a criminal he and Olinksy once put away and is determined to catch him before he injures anyone else. At District, Atwater accidentally spills information about Ruzek's past which unsettles Burgess and Platt assigns Burgess and Roman a high society dog-napping case.