Cara's shoulders squared and her eyes brightened. She seemed to be enjoying the attention, growing more confident. "Was there a hole in the ground?" she asked. Jacob took a step toward her. "What kind of hole?" "A hole in the street. Was there one near where you saw Mr. Mortlock?" Jacob and I exchanged glances. He shrugged. "We don't know what sort of a hole you mean." She rolled her eyes as if we were the most stupid people in England. "There are holes that go into the ground. I know some boys what went in one once and said it stinks down there. They said there's tunnels under the whole of London where monsters live. I told them there's no such thing as monsters," she said with all the superiority of an adult admonishing a foolish child. "I'd be able to see 'em, wouldn't I, since I can see ghosts, and I've never met a monster." "Do you mean manholes?" Celia asked. "The sewers!" Jacob said. The London sewer system was not a subject in which I was well versed. All I did know was that the sewers existed beneath the city and took London's refuse away.