CHAPTER III

THE WATCHER ON THE WALL AT THE same time that Inspector Burnley was interviewing Broughton and Harkness in his office, another series of events centring round the cask was in progress in a different part of London. Police Constable Z76, John Walker in private life, was a newly-joined member of the force. A young man of ideas and of promise, he took himself and his work seriously. He had ambitions, the chief of which was to become a detective officer, and he dreamed of the day when he would have climbed to the giddy…