Monroe holds up a pendant and asks Charlie if she's seen one before. He explains what the amplifier does, and says Rachel is going to finish building it for him. Charlie tells Rachel that she can't do whatever Monroe is asking her to do (and he just told her what he wants Rachel to do. Jesus, Charlie, try to keep up), and Monroe is all, I hoped you'd say that. He takes a gun out of his pocket and checks the cylinder. Rachel quickly steps in front of him, but the soldiers restrain her. Strausser gives Rachel Sophie's choice, but this isn't The Walking Dead, so I'm pretty sure he's not going to shoot Charlie between the eyes.
Charlie starts rambling about she's seen the militia kill dozens of people and if Rachel helps them they'll kill thousands more. None of which is news to Rachel, but she's not exactly thinking clearly. Strausser yells at Rachel to choose and Charlie says some things are more important than family (then WHY have we been WATCHING all this?!). Strausser yells some more and Charlie stands up in front of Danny and tell him to pick her. Rachel is crying. Strausser's finger tightens on the trigger and Rachel tells Strausser not to shoot Charlie -- that she'll finish the amplifier. Monroe is pleased and says Miles was right, hostages always work. He tells the others to take the kids back to their cell and if Rachel gets out of line, to shoot them both. Well, sure. But that's a cudgel you can only use once, you know?
Miles, Nora and Aaron are heading toward the power plant, which is heavily guarded. Nora asks if he's ever been here before, and Miles says it's Monroe's lab for experiments. And he doesn't know how to get in. Aaron says he does. Hooray! Aaron is useful for the second time!