Peter brings home a scanner that can pick up sounds from far away. He goes to work and leaves it, Elizabeth is there when she hears a conversation it's picking up that the neighbors are having. That's when she hears them talking about a crime they're planning. She calls Peter and tells him about it. He and Neal go to check it out but nothing is happening. He attributes the whole thing to her recent abduction. She then calls Mozzie and the two of them check out the neighbors. They discover something but instead of telling Peter, she calls Neal and asks for his help. They try to find out more info before they tell Peter.