Which famous novel's marketing campaign included fake 'missing person' posters, mysterious websites, and multimedia puzzles that engaged readers months before publication?

In the world of publishing and literature, advertising campaigns have played crucial roles in launching books to bestseller status. This trivia explores one of the most successful and innovative book marketing campaigns that changed how literary works are promoted to mass audiences. Test your knowledge about this groundbreaking advertising strategy that blurred the lines between fiction and reality.

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Dan Brown's 'The Da Vinci Code'
J.K. Rowling's 'The Casual Vacancy'
Gillian Flynn's 'Gone Girl'
Stephen King's 'The Dark Tower' series