“Two writers are suing the publishers of The Da Vinci Code, the biggest-selling adult fiction book of all time, claiming it was copied from their 20-year-old book. They claim Dan Brown, the American author said to have earned $A350 million from the book that has sold 12 million, ‘lifted the whole architecture’ of research for their non-fiction Holy Blood, Holy Grail.” The earlier book actually makes an appearance in DaVinci, with one of the characters pulling a copy off a shelf and positing that its conclusions are sound.