Book excerpt: There were four of us down there for the first thirty-two months and eleven days of our captivity. And then, very suddenly and without warning, there were three. Even though the fourth person hadn't made any noise at all in several months, the room got very quiet when she was gone. For a long time after that, we sat in silence, in the dark, each of us wondering what this meant for her and for us, and which of us would be the next in the box.