Which book's product launch included sending mysterious packages to influencers containing a working pendulum and cryptic coded messages that created a viral marketing sensation months before publication?

The publishing industry has seen some remarkable product launches that transformed books from simple literary works into cultural phenomena. Behind many bestsellers are sophisticated marketing campaigns that turned words into worldwide sensations. Test your knowledge about some of the most innovative book launches in publishing history that revolutionized how literature is marketed to the public.

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• Dan Brown's 'The Lost Symbol'
• J.K. Rowling's 'The Casual Vacancy'
• Gillian Flynn's 'Gone Girl'
• Stieg Larsson's 'The Girl with the Dragon Tattoo'

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