The iciness that had settled in Unwin's wet socks climbed up his legs and began melting into his stomach. How many blunders had he already committed? He read the next few pages quickly, then skimmed the beginnings of those chapters that dealt with the foundations of the investigative process. Every paragraph of the Manual of Detection read like an admonishment tailored specifically for him. He should have developed an alternate identity, come in disguise or through a back door, planned an escape route. Certainly he should have remained armed. In one case file after another he had seen these techniques used, but detectives employed them without any apparent forethought. Was Sivart really so deliberate? Everything he did - whether throwing someone off his trail or throwing a punch - he did as the though the possibility had only just occurred to him.