For the record, and for those of you who still send cards, it is November 13, the year – in Stevenson's case – being 1850. This is one of the reasons why I feel a special affinity for a writer who I have no hesitation in declaring Scotland's greatest. While others may prefer Burns or Scott or Irvine Welsh, the Edinburgh-born author of such classic novels as Kidnapped and Dr Jekyll and Mr Hyde is for me simply peerless.