Martha: Why on earth would you go back knowing how she feels, knowing that she lied to you...
Castle: No, no, this isn't about her. This is... (referring to the bombing victims) This is about them. You know, it's about doing something real... Something that matters. I'm not willing to let that go.
Martha: Richard, love is not a switch. You can't just turn it off. You can't work side by side with her and not feel anything.
Castle: Watch me.