Mr Halliday

In the unpublished short story The Incident of the Dog's Ball, Mr Halliday was the solicitor of Matilda Wheeler. After Miss Wheeler fell down the stairs, she decided to make a new will and asked Mr Halliday to draw it up. This new will was witnessed by the cook and the gardener. The character was later renamed William Purvis when the short story was expanded into the full length novel Dumb Witness. In the short story, Poirot does not meet the solicitor.