On leaving the office the first precaution to be observed was to abstain from attracting attention by stopping to look about me. I walked towards one of the quietest of the large squares on the north of Holborn, then suddenly stopped and turned round at a place where a long stretch of pavement was left behind me.

There were two men at the corner of the square who had stopped also, and who were standing talking together. After a moment’s reflection I turned back so as to pass them. One moved as I came near, and turned the corner leading from the square into the street. The other remained stationary. I looked at him as I passed and instantly recognised one of the men who had watched me before I left England.