“My first move was to make the acquaintance of the builder who was carrying out the alterations to Number 407, and from him I learnt in the course of conversation the name of the new tenant. He asked me to come and look at the place, an invitation which I accepted without too great a show of eagerness. In the next few days I visited the place again, more than once. I wanted the builder’s men to get accustomed to the sight of me. For this purpose I was Mr. Ludgrove the local resident, of course. As a matter of fact, most of the builder’s friends went to have a look at the place. There is always an interest in vacant premises in a street like this.