"The fact that there were lots of Mary Kellys you could check was both a good thing and a bad thing for us. Good because you’d be occupied tracking them down for the whole damn week, bad because it made it harder for us to point you at the right bloody one. We took a while to figure that one out, I can tell you. Meanwhile, we simply suppressed all the data regarding our little Typhoid Mary, got her out of sight, let you waste a week—or most of it—with the others and then, presto! Up she pops. And when she did, you knew for sure it had to be the right one, because the others were hopeless, let’s face it."