Which novel holds the record for the most expensive book marketing campaign in publishing history, with over $20 million spent on its launch in 2003?

Product advertising in the publishing world has evolved dramatically over the decades. From simple newspaper ads to elaborate multi-platform campaigns, publishers have invested increasingly significant resources to launch potential bestsellers. This trivia question explores one of the most notable marketing expenditures in literary history - can you identify which book received unprecedented promotional backing?

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• Dan Brown's 'The Da Vinci Code'
• J.K. Rowling's 'Harry Potter and the Order of the Phoenix'
• Stephen King's 'Wolves of the Calla'
• Elizabeth Kostova's 'The Historian'

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