I received a mysterious package in the post last week. It appeared to be a book, but was really a box containing 100 curious postcards, which told the story of many murders. OK, so it was only mysterious because I'd forgot that I backed The Researcher's First Murder on Unbound several months ago and the "book" only just released. I'll call it a book for lack of a better term. This project is the brainchild of John Finnemore - noted British comedy writer. Those…