Have I Befriended a Murderer?

A writer named Edward Abel Smith discovered the criminal case file of Diana Garbutt, a woman murdered by her husband Robin in 2010, while researching at the National Archives. Smith subsequently befriended Robin Garbutt through prison correspondence, which culminated in Robin calling from Wealstun Prison to congratulate Smith on his book being named The Times Book of the Week, raising troubling questions about the nature of their relationship.