In 1986, when I had just started at the bookshop where I still work, I was given a book by a tall, amiable man in late middle age. He was the book’s author and he had just reprinted it himself. He imagined I might be interested. Branko Bokun’s Spy in the Vatican begins, ‘In April 1941, Yugoslavia was invaded by Germany and her allies. With the surrender, a new State of Croatia was formed. The Ustashi, a band of Catholic fanatics, backed by the clergy, decided to eliminate all non- Catholics in Croatia. Orthodox Jews, Serbs and Gypsies – men, women and children – were slaughtered in their thousands.’