Appetite knows what it craves, without cerebral embellishment. It tends not to waste any time laying hold of its tools. That was the thing I had recognised here: appetite. I recognised it precisely because, in a context like this, it was so unfamiliar. It had forced me to rule out everything else. And there was a second reason for my recognition, which because unprecedented was not recognition at all, but astounding discovery: Martha's face told me. I saw appetite there...